You cant. Every girl is different and so is every guy. Just
learn body language and apply your knowledge accordingly.
Personally, I find that ONS are always messy and sg is too small
without word getting around.
Not to mention the risk of having infections, herpes can spread
through skin contact alone. And its incurable. I think this alone
greatly overshadows passion for the moment.
Get to know the person first and see if he/she is willing to be a
casual partner without any emotional or physical hitches.
Doesnt that make more sense?
