What does friends with benefits mean?

I ask because I posted an ad, got some replies and talked to a few girls. They asked what friends with benefits means to me and whether I would do things like take them out for dinner, fill up their car with gas and stuff like that. In my world, that is being a boyfriend. Do I need to put the term... show more I ask because I posted an ad, got some replies and talked to a few girls. They asked what friends with benefits means to me and whether I would do things like take them out for dinner, fill up their car with gas and stuff like that. In my world, that is being a boyfriend.

Do I need to put the term "Looking for a f**k friend" in my ad just to be more clear?
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