No they're not. I haven't got a D&D rulebook handy this moment, but I invite anyone who believes this to open one up and start counting. In a typical book, you'll find a couple of barbarian men in loincloths--and a couple of women who aren't baring cleavage, midriff, or legs up to the thigh. Numbers-wise, there's no comparison.
Furthermore, as Elf Witch pointed out, there's a huge difference between the "barbarian in loincloth" look and the "pornified armor" look. There are people in the real world who wear loincloths as practical everyday garb. Chainmail bikinis are only practical everyday garb if you make a living as a stripper at a medieval-themed bar.
I fail to see why we need cheesecake. I don't think any male in the digital age can claim to be porn-deprived. How about we let porn be porn, and D&D books be about D&D characters?