Why does my partner's condom keeps coming off inside?

Quite often when my boyfriend and I have sex, the condom disappears into my vagina. As you can imagine, it is extremely mood killing and a little disconcerting for me to have to reach up there and find it. I read your response to another couple with the same problem, and we'll definitely make sure to hold onto the condom before pulling out. I use Depo-Provera (so the condom is used just to be extra sure), so I'm not particularly worried about pregnancy. What I would like to know, though, is why this happens to us so often? I've never lost condoms with any other partners. I also have the feeling sometimes that it might be coming off before ejaculation. This seems to happen quite frequently (one out of every two or three times we have sex). It's kind of frustrating. Is there anything else we could do differently?


Are there any ways to stop crying?

Are there any techniques for controlling crying? I doubt that my problem requires clinical attention; however, it frequently manifests itself as a serious handicap. During conflicts (particularly with professional superiors or with significant others), I find myself unable to defend my position, which only makes the problem worse. Sympathy only tends to aggravate the crying and it is impossible to stop once it starts. I am a twenty-four-year-old graduate student, and I don't seem to be growing out of it. Any suggestions would be greatly appreciated.