May be of use
http://www.harekrishnatemple.com/4regs.html
4. No illicit sex. Cleanliness is destroyed by illicit sex. This is sex outside of marriage or any sex for any purpose other than procreation. Sex for pleasure compels one to identify with the body and prevents one from understanding Krsna consciousness. The scriptures teach that sex is the most powerful force binding us to the material world. Anyone serious about advancing in Krsna consciousness should therefore abstain from or regulate sexual activity according to the scriptures. In the Bhagavad Gita, Krsna says that sexual union for conceiving a child to be raised in God consciousness is an act of devotion to Him.