<human>: I'll keep this short and sweet. 

For the past couple of months, the sex has been quite scarce, and now I think I know why. We have both cheated on each other in the past, but it has been quite a while since either of us has. The last and only time I have cheated on him was when I was a sophomore in high school, and him about two years ago. I thought that we had gotten past this, because since he has gone into the military he grew up (or so I had thought). 

I am very open to trying things sexually with him, and we have even gone as far as trying to do the whole swingers thing. He has been looking for a W4MM WM4M or W4M, which I have told him in the past that I would really want a three-some, but he always tells me that that is in the past for him, and he is not interested. 

Like I said, the sex has been scarce, and he has been masturbating instead of having sex with me (but I talked to him about it, and he still is doing it. I don't care about porn, but it's disrespectful to me when I have been begging for sex, and then he would rather masturbate while I'm asleep or in the other room). 

How do I approach him about this? I would like to talk to him about this before doing something irrational.

Can you give me the gist of the text in a nutshell?
<bot>: My husband and I haven't really had sex in quite some time, and now I have found that he has been searching for a fling.