As a matter of fact, if you read the New testament nothing is said about "purity". The bible does mention it as a sin(Sodoma, I think) , but doesn´t get too much bad press. The worst sin in the Bible is Avarice, the root of all evil.

The church only started to condemn all sexual behaviour from the third century. It´s all a campaign from the catholic church. Who cares?

Besides, who says I am a good catholic.