<human>: I'm female and just out of college.  I met this guy I want to start dating.  One question I have is when is the best time to have sex?  I've had enough one night stands to know that I don't want to give it up until I find out if we have real feelings for each other and have compatible personalities.  I will also ask that we both get STD tests, because I don't want to end up with the herp or anything like that.

One worry I have from past experiences is that once I start having sex, it seems like men's level of involvement in relationships with me drops after a couple months.  I have not always dated the best men, and I'm working on that.

Maybe I think that a lot of men only like me for sex.  But I need to know how long is good to wait without being a horrible tease, but still not putting into effect the whole "don't buy the cow if you get the milk for free" thing.

Provide a brief overview of the text.
<bot>: When is the best time to have sex, so the man doesn't take advantage of my willingness and take me for granted (never "buys" the cow because he gets the milk for free)?  Thanks!