He attempted to have an affair. The fact that he stopped when she protested and drove her home instead indicates he didn't attempt or intend to rape her. He still absolutely committed sexual assault though which is why he was found guilty. Consent for any sort of sexual encounter needs to come first, not during or after, and removing someone's shirt and bra definitely requires consent.
When dealing with situations like this, it's important to be very clear and precise. There's unfortunately a lot of actual rapes that occur, and they shouldn't be muddied by situations where someone calls rape when it isn't leading to people downplaying real rapes.
It's the same reason I don't like seeing people put on the sex offender list for public urination just because it happened near a school (even if there were no youth there at the time) or like the case of a man that got put on the list just a couple years ago for writing a short sexual story (completely fictional) simply because it contained teenagers who weren't 18 yet.