You posted this in the Sexual Health forum also, didn't you?
This is what I wrote over there, and I think I'll stick with it:
Before you start thinking that your boyfriend is obsessed with masturbation and has it on his mind all the time, COMMUNICATE with him and see if you can get him to talk about it.
Jumping to a conclusion is never a good thing, especially when you can simply ASK a question and get an answer. It may surprise you what he says.
It may simply be that he has a VERY strong sex-drive, and the fact that you guys had sex for over an hour made him think that you wouldn't want to have sex again so soon after (so he decided to take matters into his own hands).
Talk to him and ask him why he was doing it, then possibly offer to assist (if you're okay with that).
hmmm, I wouldn't be to alarmed...guys masturbate often. I don't think its anything to jump ship about!
Now if he keeps doing it after sex I would then question him & ask him straight up what that's about.
I find it alil creepy, that he is doing that a month into your relationship.. How old are you guys?
My bf masturbates alot, sometimes in the same room when Im sleeping, but it dont bother me, cause im not all that interested in sex, so it keeps him off me most of the time, BUT we have know each other for 9 years, so he just feels to comfortable around me i guess.
I Think its very weird for him to be doing that, but as women we dont know what goes through there mind.. my bf tells me all the time that out of nowhere he gets the strong urge to get off. So maybe thats the case, sometimes they cant help it I guess
A month into the relationship, and 4 hours after hving sex? Uh Yeah! I would think that a red flag for sure. And a real turn off as well. And I can understand your feelings. Me be gone.