Guy says 'its gonna cost you but not money' what was he insinuating?

This guy I recently started talking to said 'its gonna cost you, but not money' when I asked for a favor. I said 'what will it cost me?' And he replied with 'we will see how well the first date goes then you'll find out'. What do you think he was insinuating? Kiss, bj, sex? Lol something else? I was kind of surprised to see him write this, because from what I can tell he seemed gentlemanly. Thanks fam
Guy says 'its gonna cost you but not money' what was he insinuating?
Post Opinion