Virginity & Literature

I was going through some online literature available and then Everywhere in philosophy I found that sex is not-pure (not using the word impure) and being Kumar/i is advised.

I want to know why. And where can I find all the fundamental-literature in written format?

Do you mean the BKs' fundamental-literature?

Do you read Hindi? It's here:

http://PBKs.info/murli_s.html

Mostly celibacy in religion, certainly within BKism, is a tool of control, the management of resources - including financial ones - and a means of separating you from other influences.

There plenty of places, religions or schools of thought where fulfilling your sexual development and family life is encouraged.

The BKs don't because they want you to surrender all you money, property, time & energy to them. If you had a non-BK partner or children, they would need your attention.

It's all about monopolising your resources. They have no family and no income, so they need you & yours as their "children".