Sex Buddhist Scripture

The Scripture related to Buddhism about sex is the third of the five precepts

I undertake the training rule to abstain from sexual misconduct.

In the ancient langugae of Pali it is said

Kāmesu micchācāra veramaṇī sikkhāpadaṃ samādiyāmi.

more general here

 186-187. There is no satisfying sensual desires, even with the rain of gold coins. For sensual pleasures give little satisfaction and much pain. Having understood this, the wise man finds no delight even in heavenly pleasures. The disciple of the Supreme Buddha delights in the destruction of craving.

http://www.accesstoinsight.org/tipitaka/kn/dhp/dhp.14.budd.html