This was a few years ago and yes he was legal age (18).
He was super cute (bit of a fuck boy type) but hey, whatever. He hit me up casually over FB post graduation and was doing the whole “thank you” stuff and I was trying to keep it professional. I was just being nice and asking about summer plans, etc. and he said him and his gf (also 18 and also a student I knew) went to the beach and wanted to go more, blah blah blah.
Unprompted, he sends a pic of him and her at the beach, him shirtless and her even looking hot in a bikini. I had noticed he took a screenshot from his camera roll and could see some of the other pics were… more revealing.