I'm not sexually active and I'm not dating anyone but I like this guy
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I've heard a few different things about this. One expert says 10 dates is long enough. Another says three months. Between the two, I'd better trust the first option.
Basically though, it's fairly easy to see whether a guy is just into you for sex or not. Just don't give him sex and see if he stays. One past boyfriend of mine left after two short months because I wouldn't sleep with him. My current boyfriend, I slept with after about 7 months and I haven't regretted it.