Well I kind of Dissociate the invitiation to dinner and such to the acts of sexual nature even though there is often a correlation between the two. I will generally always pay when I am with a lady, be it my mother, a girlfreind, just a freind or even just somebody I just met only because that is the way I was brought up. However, apart from how I may be attracted to someone, the reasons she is attracted to me will determine whether what has happenned can be compared to services paid directly as you seem to infer.