@jim 1968,
Does she make you laugh? do you think sex with her would be fun?
Is there ever a time when condoms aren't appropriate when having sex with someone you're not in a long-term committed relationship with?
Does sex necessarily have to mean there's a relationship in the future?
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be honest with her. if you want to have sex but aren't into the idea of a relationship - tell her that.
talk in person about this stuff - not by email/text
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if she doesn't make you laugh, my advice would be not to bother with it at all.
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by social diseases, you mean sexually transmitted diseases - right?
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are you a total skank? if not, why would you think that about her?