My boyfriend and I have been together almost a year and a half. We have lived together for almost a year. We both work full time and I also go to school full time, and I feel like sex is getting a little boring. He doesn't like to talk about his ex that he broke up with a year and a half before he met me,which I completely understand. I have gotten some information out of him since we started dating that they had sex in a car, movie theatre and hot tub. But when i suggest something more adventurous he refuses. I'm two years younger than him..... maybe he's just over that stage in life? Help!

I don't know how old your guy is but my guy is 29 and he's happy to get down anytime, anywhere. So, that leads me to believe it isn't a stage in life that guys get over. No to mention I once walked in on an older couple having a great time in the locker room at the gym. Ick.
Maybe you can have a conversation with him about WHY he doesn't want to try different things. There are many more ways to have adventurous sex then just trying new places. You can dress up, role play, use toys etc. There are lots of ways to have great, fun sex. I think you might want to start with a very open conversation with your guy about what you want and what he wants (or doesn't want) first.

"Adventurous Sex" is different than "Public Sex"...what you listed about his past sex life has a lot of public sex, which is dangerous...I'm thinking that something bad happened or almost happened during one of his encounters and it took away the fun from it. Many people who think they like the "could get caught" feeling end up NOT liking it when they DO get caught (and risk legal repercussions).

Are you equating "adventurous" sex with might-get-caught sex? Or have you tried suggesting other things to do in private?

It's completely fair to tell him that, in your opinion, sex is getting stale and you're working to keep things exciting and new, and ask him about what things he's wanted to try with you. There's a TON to do, and I will guess that he will either help you figure this out or that you two aren't going to make it for the long haul.

^ I agree.

There is a big difference between "we only do it in missionary" and "let's get down in a public park". Perhaps you could initiate in a different room than the bedroom, go away for a weekend, etc.

He's not really helping by flat out refusing you here. How are you bringing up the topic?