a lubricated polyethylene sheath that is inserted into the vagina. A ring grasps the bottom of the cervix. The sheath extends outside the labia. They are expensive, but most guys don't even know they are there unless they explore with fingers. You can buy disposable underpants with these things in place so that the woman can go out on a date all set to fuck "protected".
Susie used a female condom the first time, that way there was no interruption to put on a male condom.