Is this woman completely clueless as to why a man would give something to an unknown woman for free?
Or was she happy to be a sexual object only when it comes to getting free stuff, but not when it comes to reciprocation?
So either the woman is feigning ignorance or exposing her stupidity. I think it is the former. It sets up the purpose of the article.
The woman is going to be offended no matter what eventuates.