Should I ask my boyfriend to delete dating site accounts?

My boyfriend (22) and I (20) have been in a serious relationship for about a year. We were good friends before that. We live together now, and we are planning our lives around each other in ways such as discussing where we will be moving together after college. I noticed that he still has dating website accounts such as okcupid and a few local ones.

Should I ask him to disable them or delete them? Or at least put he's dating someone on the sites? I don't think he actively goes on these sites but I am a bit worried, since early on in the relationship we had some problems with him being very sexual when talking to girls online.

One time he almost hooked up with a girl when we were dating, but he got caught by me before it happened by him leaving his facebook open at my house and having the girl IM him and I saw.