8 strokes in and done...

My bf and I have sex quite often some times with a condom but most of the time without one. Last night was a little different where we normally have a lot of foreplay before actually having sex but this time we went to just a little light playing to doggy style. He came in literally 8 strokes. It's almost never that quick. You think it was just the friction because I didn't have time to warm up or was he just super horny or what?