Gopal,
STDs that cause sterility are no picnic. You can have pain, infections, fevers, mental disorders - STDs are nothing to deliberately seek out.
Given what you have said online previously I think you would be wise to seek out a vasectomy. That gives you nearly 100% guarantee that you will not inpregnate anyone - unless you have it reversed.
These are inexpensive, virtually painfree ( I am told), and do not change how you experience sex. You need to be really sure you want no children though - because reversal is not always successful. It is also not a guarantee -although very few pregnancies have resulted from a man with a vasectomy.
Do not deliberately seek out an STD - you may get much more than what you have bargained for.
Susan