I doubt that many 18 y/o males are fine with it since that doubles the chances that they'll be forced to enroll in the military for very little pay. I'm sure most other people would prefer that 18 y/o males continue to be the selectively signed up and have no problem with females not doing the same. Imho though, either everyone should be forced to enroll or no one should - most military workers are support staff anyway.
Speculate as you please. This is an extremely obscure issue, and I suspect that very few people have a strong opinion on it. (If I'm wrong about this, it should be easy to point to a counterexample.)
It is an extremely obscure issue because the vast majority consider women signing up for the draft to be ludicrous, and dismiss the conversation thereafter.