Perhaps you mean "What do Christians think about this?" If you just mean religious people in general, then go check out the Kama Sutra. It was written about a squillion years ago by a group of extremely devout Hindus, and it has been used as a sex manual ever since.

As a Christian, I don't really have any problem talking about sex or even same-sex relationships. Just do what feels right, as long as it's monogamous and loving, not just random one night stands. Even St. Paul agrees with me. To him, mere copulation, not marriage, made "one flesh" out of a pair. That's why I believe sex should be monogamous; it creates a transcendental bond between the couple that should never be breached. It's the love that really matters. Marriage is little more than a social construct. Like baptism, it is the exterior representation of inner grace given.

So there's my two cent's worth. Take it how you will.

__________________
Men of England, heirs of Glory,
Heroes of unwritten story,
Nurslings of one mighty Mother,
Hopes of her, and one another;

Rise like Lions after slumber
In unvanquishable number,
Shake your chains to earth like dew
Which in sleep had fallen on you -
Ye are many - they are few.

- Percy Shelley, "The Masque of Anarchy"