There are some other implications people are ignoring, Handsome Guy was already sniffing around Diana and attempting to talk to her. That's why she angrily said look I don't even know you when he/Steve walked up to her at the party, because it wasn't the first time. At the end of the movie it's clear they like each other and she'd probably give him a chance and if she did, he'd go for it. You can't "rape" the willing, especially a man because he'd have to rise to the occasion.