Christians: Do believe that the purpose of sex is for procreation only?

No, what would be the fun in that?

Nope, I sure don't. In species with a high capacity for abstract cognition, sex serves manifold purposes, often social and having little to do with procreation.

Sin is intentional harm or undue risk. If something makes two people happy and doesn't hurt or unduly endanger anyone, where's the sin?

Are those the only options? Procreation only or pleasure only? What about believing that God created sex as a package deal and it is not our place to separate these two aspects?

No. Sex is also for bonding and creating intimacy between humans but the only way to get that bonding and intimacy God is talking about it must be between a man and a woman in marriage.

Well Leveticus 18 lists the forbidden sexual practices, but it does not state that sex for the sake of pleasure is wrong/forbidden.

I don't know if there's a verse that talks about forbidding contraception, but that's a belief that Catholics have, that birth control shouldn't be used, because God gave them marriage and within marriage you're allowed to have sex, which consequently, babies are produced. However, that implies that people don't have sex outside the sanctity of marriage and all that, which, if you DO have sex outside marriage, it probably means you're not going to be bonded to this person, which means you're having sex for pleasure, and not for procreation.

no

and I guarantee that no male Christian thinks that way either, no matter what they may have told you

Read The Song of Solomon if you think the bible indicates that sex is not for pleasure

The pleasure is between husband and wife. Not between man and dog, woman with horse or man and man or woman with a football team.

Its also celebration of the oneness of a man and his wife

No, it is a blessing between a husband and wife.

Peace be with you.

No, it is a beautiful gift given to us by a God who cares how we feel.

Like every gift, we have to use it responsibly.