Some will be fishing for pictures

Some just enjoy the hunt. Once they know that they are guaranteed to get laid, the thrill of the chase is over

Some will be in relationships they’re unhappy with, and want the validation of being desired without actually going through with things

Some get a stark hit to their horny brain when they realise that they are actually about to go through with things, and realise that it’s not actually what they want

There are as many different reasons as there are different people