It's encouraged by Paul to be avoided.
That is subjective though, it is between you and God. From my total outlook on it, it would be best to do those things with your wife, its just between you and God on what you do, according to Paul it is the only sin that actually totally effects the entire body.
1 Corinthians 6:18-20
Amplified Bible
18 Run away from sexual immorality [in any form, whether thought or behavior, whether visual or written]. Every other sin that a man commits is outside the body, but the one who is sexually immoral sins against his own body. 19 Do you not know that your body is a temple of the Holy Spirit who is within you, whom you have [received as a gift] from God, and that you are not your own [property]? 20 You were bought with a price [you were actually purchased with the precious blood of Jesus and made His own]. So then, honor and glorify God with your body.That is subjective though, it is between you and God. From my total outlook on it, it would be best to do those things with your wife, its just between you and God on what you do, according to Paul it is the only sin that actually totally effects the entire body.