I don't say this about all the chicks, but I think the ole bastard genuinely wanted to breed Lexa. He was dead set on it.
In all the videos with her he never ONCE pulled out, not even a little bit, and he usually locked her in his prone bone breeding position and held himself inside for a while after ejaculating in her.
Maybe that's what threw her off ultimately...
Dfw wasn't just fucking her, he was trying to knock her up--all the while she had the drama with her fiancé spinning around in the background (all of which has been documented and discussed before).