Mike is the first to move far away from Hawkins. Over the months and years all the party take their turn to drive/fly out and visit, and it pretty much inevitablely turns to sex each time.

Please don’t end it with a ‘and then he found true love with (El-or-Will) and stopped fooling around’ OTP ending. No. He’s the HEART, and only Robin and Nancy get a free pass from not hooking up with him at least once.