I think you've got to be sensitive if you find she reaally does have a boyfriend. Personally there are several situations where I wouldnt go further and some where I would. I'd base this decision on her responses and how much I wanted her. Make her say 'no' basically. I tried to kiss this girl once and what felt like minutes holding her waist, pushing her on a wall, trying to talk and kino her into doing it while she giggled and smiled and said 'no no I have a boyfriend!' It was fucking fun. She loved it. Always find out if he's in the club or I would guess odds are high on feeling a sudden punch to the back of the head.