I've used them for duos, for the reasons skbinks mentions - they make it much easier for the guy to switch back and forth without having to worry about changing condoms constantly to avoid cross-contamination (pardon the phrase).
They're also all kinds of awesome for dudes who have trouble keeping standard condoms on, or who are too big for even the XL ones or who have trouble staying solid the whole time. And they're nice for standard guys who like the friction and lack of restriction, too. *laughs*
The only caveat as far as safety goes is that you should make a point of holding down the outer rim of the FC with your fingers as the guy slides in; there have been cases of guys (intentionally or not) slipping in around the edge and sneaking a few strokes of BBFS before getting re-situated.
Oh, and they're latex free - as far as I know - which is just another point in their favour.
The female condom has a higher failure rate than the male condom. Condom failure means it's possible to contract sexually transmitted infections or become pregnant. The female condom may not protect you if:- The condom breaks
- The condom slips out of the vagina
- The penis slips between the vagina and the outer surface of the condom
- The outer ring of the condom gets pushed into the vagina during sex
The female condom may also cause discomfort during insertion, a burning sensation, itching or a rash.
Originally Posted by guykc
Oh, and as far as those points go...I can say that in 2 years of using FC with the majority of my clients I've never had one break or slip out. I'd actually bet that they're stronger than male condoms since they're able to be thicker, but I'd have to look up statistics to be sure.
And as far as the outer ring getting pushed in, you can just reach down occasionally and check to be sure it's still in place. I've only had it slip slightly inside once and a fingertip was enough to catch the ring and get it re-settled.