I think Jill was focusing on the practical, physical ways the condom could fail - as opposed to just the silly ones.
The problem with a female condom that protects a woman from STD's is the same problem that protects a woman from rape; sexual technique.
When you try to insert a penis into a vagina with a female condom inside it, you have to do some tricky "maneuvering" to make sure you stay inside the condom, and not just shove the thing back into her. The less care you take, the more likely this will happen. In fact, it's pretty much guaranteed if you don't REALLY try to get yourself inside that condom.
The problem with a female condom that protects a woman from STD's is the same problem that protects a woman from rape; sexual technique.
When you try to insert a penis into a vagina with a female condom inside it, you have to do some tricky "maneuvering" to make sure you stay inside the condom, and not just shove the thing back into her. The less care you take, the more likely this will happen. In fact, it's pretty much guaranteed if you don't REALLY try to get yourself inside that condom.
Rapists are a little busy with raping to bother.