[BikerNYC]

Homosex is unnatural use of sexuality because it is not productive and involves only one's self and "partners." It is a closed system that shuts out society and God. It is sinful.

Is this why any form of birth control is sinful too?

[StAthanasiustheGreat]

Yes, the source of the Roman Catholic Church's condemnation of Birth Control stems from this. The purpose of sex within marriage is children, and birth control eliminates this possibility. God Bless

[arthurus]

Is this why any form of birth control is sinful too?

Interventional forms and onanism, yes. Thes are not such a public problem among Christians because contraceptionists as contraceptionists do not molest children or others over whom they have authority. Contraception is more a private sin. It is generally not flaunted.