No just no.
First off the familiar Christian buzzword fornication is not actually in the scriptures. The word comes out of the Latin and retrofitted into Christian Bibles.
Secondly, there is no requirement anywhere....Old or New Testament for wedding ceremonies or vows. If a couple meet and start kissing, fondling and have sexual intercourse....and they stay together....they are married. That is what happened in the biblical era, then there was also arrangements by fathers that occurred a lot of times. LOL It was usually a delivery. The groom paid a bride price and the father was required to deliver a virgin daughter. The Hebrew language did not have a word for wed or wedding. In the New Testament there were lots of weddings, but they were Roman. Over a thousand years later Christianity adopted the custom of weddings and vows....And it was the Protestants that first made weddings a requirement.....that is 1500 years after the biblical era. And they adopted the Roman template for weddings. That is why that we have so many Pagan customs in our weddings ceremonies. And I do agree with the Protestants about weddings and vows....and the bigger and more fancy the better.
Oral sex isn't approved. What a joke! Where was it disapproved! God never got into the business of regulating relations between a man and his wife. No specified position, no limitations of orifices. The only limitation is that sex and marriage be between a man and woman. You shall not lie with a male as one lies with a female; it is an abomination. Leviticus 18:22. Since men do not have female genitalia this is referring to males that have anal sex with females. "as one lies with a female" Not that I recommend it!
When the Hebrews had multiple wives, God did not regulate sexual activity between them or how many of them at the same time.
It is better to refer to sexual sin as sexual promiscuity. Sexual relations is a matter of love and respect, respect for yourself and respect for the person you love. They call it making love for a reason, love needs to be part of the equation. Again we are not animals, love, respect, and compassion.....for an event that can produce life....that life is part of the consideration.
The Greek word
porneia is a general term for all unlawful sexual intercourse. It includes adultery, prostitution, sexual relations between two single or unmarried individuals, homosexuality, and bestiality.
Jehovah God is the Author of marriage. He arranged for the first marriage. In Eden God saw that it was not good for the man to be alone, that he needed a helper as a complement to him. Genesis 2:18-25 says: “And Jehovah God said, It is not good that the man should remain alone, I will make for him a helper as his counterpart.” Jehovah God filled this need when he made “a woman, and brought her in unto the man”. Immediately thereafter the two are spoken of as man and wife, as being of “one flesh”. Why were they spoken of as man and wife if they were not United as man and wife?
In the scriptures a man and woman didn't just meet and start having sex and if they stayed together they were married. Before a man and woman consummated, there was an arrangement as you said, of a man going to another man who had daughters who were virgins. I bride price had to be paid which the Father of the daughter determined what that bride price was. If the man who was there to get a wife for himself or his son and was able to pay the bride price the father of the daughter would ask her if she agreed to this arrangement, if she agreed, at that moment of her agreeing she was the wife of that man paying the Bride price or his sons wife. So when the woman went into that man's tent who paid the bride price or went into his son's tent she was already his wife before having sex. The sexual act was a consummation of that marriage contract. Like I said you will not fine a place in the scriptures where a woman who came to a man or went into his tent where such arrangement of a bride price being paid before hand and the woman agreeing to be said man's wife. So any man and woman coming together and having sex as you were speaking of, were already considered man and wife before having sex.
As for what you say about a man having multiple wives, one has to understand that a threesome is never mentioned in the Bible. Also we have to understand that the examples in the Bible where polygamy existed, the scriptures show the women would only engage in sexual activity with their husband one-on-one privately. The husband is never said to have sex with all the wives at the same time or on the same day for that matter.
There is an example of polygamy, that two women did engage in sexual activity with a man but not at the same time. They agreed to engage in sexual activity separately. The example is the two daughters of Lot. Genesis 19:30-38 explains the two daughters agreed to engage in sex with their father one at a time but not together at the same time. They were lots daughters not his wives however.
Another example is Rachel and Leah who were married to Jacob (Genesis 29:21-30). Jacob was a man with two wives. In Genesis 30:15 Jacob’s two wives bargained for an opportunity to have sex with him. The passage says that Rachel offered Leah the opportunity to engage in sexual activity with their husband if Leah would give her some mandrakes. This shows a strong implication that the two wives did not engage in sexual activity with their husband at the same time. They engaged separately in sexual activity with him.
There are no examples of threesome sex in the Bible, but there examples of men with more than one wife. In these cases the women would have sex with their husband privately, there's no evidence in the scriptures that the husband had sex with all his wives at the same time.
When it comes to love, yes it needs to be part of the equation, but the first love is to the True God Jehovah first, which means I agree we stay within the scriptures, with the understanding that there's no scriptures that approve of threesomes among married people. You can't find in any scriptures where the wives had sex with there husbands at the same time, but instead the scriptures show they had one on one sex privately with their husband and not at the same time.
Also before a virgin had sex with a man, arrangements of a man paying a bride price for a virgin and that woman agreeing to this arrangement therefore becoming that man's wife or his son's wife would happen before having sex. So I say again you will not find in the scriptures that God approves of sex between two single people unless that man and woman are man and wife before having sex.