Frankly I would imaging getting them to come with penis only no hands or mouth employed at all is a far rarer feat. Shit, I was sexually active for nearly 15 years before I had my first "intercourse only" orgasm, and it's only happened like maybe three other times since then.
Granted, for those ladies who are "properly constructed" I guess the idea of not being able to come through straight intercourse is an odd idea, probably right up there with trying to imagine a guy who can get it up but never orgasms