No offence to anyone here but if this is a debate on Christianity, everyone needs to do allot of reading and study first. Posts seem most interested in pointing out modern historical arguments against biblical passages and the difficultes of living a sin free life (it is in fact impossible) which means the essence of Christianity is totally misunderstood. And this is of course the source of the attacks on the faith as people get personally offended by being made to feel guilty for their sinful acts. Guilt being a sin as well, a very destructive one that sows doubt in oneself and the divine. Well, best wishes in your studies for anyone who pursues a better understanding.
Since this thread is largely negative and was asking a specific question, I also reposted to add that there is a positive side to Judaism and Christianity regarding sex. It is referenced in the context of marriage (keep in mind marriage was the norm throughout the biblical period) but the Bible does in fact command the love of spouses to one another--this includes a strong emphasis on sex and fulfilling each others' needs: physical desire, lusts, and fantasties. The Song of Solomon is layered like all bibical books and ultimately describes God in mystical form, but it places love making in a very powerful and beautiful place in the cosmos. Again I am not saying that wife swaping is acceptable biblicaly, but in Judaism men could marry multiple wives and gentile traditions are not addressed as the entire Bible is Judeo-centric text. I am not aware of addressing single sex life or group sex other than it is mentioned as a fact of life, as is prostitution, in the Hebrew Bible and condemnation of basic fornication by some prophets and Christian disciples.
One last note regarded Jesus of Nazareth himself and his possible sex life. The tradition of Jesus being married was a Merovingian invention to promote the divine right of Frankish kings, nothing more. Is it possible Jesus was married as all of the Apostles were? Yes, but I would not bet on it. He also speaks of rare individals who devote their lives to service to God (some prophets, monks, medieval mystics, Isaac Newton even fits this) and Jesus is much more likely the chief example of those who have only passion for God. Note that this has also been used by the Medieval Church to require clergy to remain celibate, by others to promote homosexuality. Both are ridiculous as the Greek word used in the gospels means "eunuch" refering to a spiritual servent of God and the Chruch who does not pursue their own selfish desires. Well priests (most at least), homosexuals, and the heterosexual masses clearly do not come close to this lofty spiritual trait.
As for me, I do my best to live an honest life and pursue the passions of my heart, but I am also very horny!