I've known a couple of ladies who could hide a regular condom in their mouth, and they'd unroll it onto lil' Johnny during 69 action. I'd barely notice it was on until we'd switch back to "99"...
With a female condom, it might be fun to try that trick in reverse, with my lady laying back for DATY, and whilst licking her clit, I could tenderly slip the female condom into position... WOOF!
I'm sure I'd need lots and lots of practice, just need to find the right teacher!
http://www.amazon.com/FC2-Female-Con.../dp/B001GKK4AY