Those women were either lying or exaggerating. Woman have babies through that canal, and a baby's skull is much larger than any man's girth. There is no way these women were "physically unable" to have sex with some man. It might have been uncomfortable for them if they were especially tight, but they could have done it.

This reminds me of men who claim that normal size condoms are "too small". Again, total BS. It's quite easy to blow one up like a balloon without it bursting. A larger one will be more comfortable for someone large, but the regular one will stretch to fit.