....according to the Biblical perspective...
Satan is bringing every unnatural gratification to couples that he can concoct....BUT it Is Written in Romans chapter 1 that "a man ought NOT leave the Natural Use of the Woman and likewise the Woman not Leave the Natural use of the Man". The Natural use can cause reproduction in Human Beings. (not "will cause" but CAN ) I petitioned God in 1982 when a babe-in-Christ was seeking a way to not "fornicate" and asked if "it's okay to perform Oral Sex on her boyfriend instead" I was totally unfamiliar with the act except that it seems unclean, so I said "let me go before the Lord with that", (He answers my spiritual requests really fast) the next day I called her and said the Lord spoke very clearly saying "tell her, Any Sex Act that Cannot Produce Legitimate Offspring in Human Beings, it is Not of God'; and He repeated it twice. This is what I tell all who ask on this matter to this day and it includes every deviate, unlawful, criminal, and sensual sex act known to man.
The bed IS undefiled yes with lawfully Married couples (not all married couples are legally bound to each other in God's eyes) it does not mean you are at liberty to perform deviate unclean sex acts, consensual orgies, threesomes, swapping, using jackets, chains, whips, buckles, toys, gels, creams, costumes, wigs, photos, mirrors and videos and such like in your bedroom or anywhere, such things are unnatural and unnecessary and not required for human reproduction. When a couple feels they must deviate from the natural it is satan dissatisfying their thoughts of the act, so they will explore his damnable suggestions and he can inflame their souls with an unholy fire of lust for the unnatural. The mouth is to speak and only take food and drink or emit the same when ridding itself of toxins or foreign bodies. PERIOD. Food does not come out of the genitals so NO MOUTH BELONGS THERE, EVER !!! Nature itself teaches us it is obviously wrong, yea even an abomination! IT WOULDN'T BE NATURAL OR NORMAL ! Don't use Solomon as an example, before he gave his life to God he had hundreds of wives and multiple hundreds of concubines and was sexually active with ALL OF THEM. Normal couples who love God are easily and immensely satisfied with their lawful spouse with natural intercourse alone. Many say it's not in the new testament but the scriptures below tell us otherwise as a warning. We cannot redefine sin, simply because we choose another way.
Thou shalt not lie with mankind, as with womankind: it is abomination.