The cap is a lot smaller than a diaphragm - more, um, uncovered surfaces = more sensitivity and less to get in the way. The only downside is that mine was so comfortable it was possible to forget about it. Ewwwwwww. Geez, maybe some things are too personal for TE!

At least the kind I had (the Prentif cap which I don't think is imported into the USA any more) could stay in for 24 hours or longer which allows for spontaneity. IIRC a diaphragm has to go in pretty much right before sex.

Hang in there red. This is tough - you're allowed to feel whatever comes.