I happen to like girls who initiate sex with this sort of challenge. It is a straightforward alternative to the verbal or social challenges that fill the same role more frequently. In fact playing out the dynamics so directly rather than in the verbal world helps prevent any confusion as to whether verbal expressions are a façade to test character or a boundary. 'No' could always mean 'no' and never mean 'I'm not comfortable yet, pull back and continue the mating dance'.

Rape is bad/evil/other/death-spiral. But this trope doesn't encourage rape.