Maybe you need to look a little harder.
Yes, Walmart might have more choices for women than men, maybe, but it's not hard to find plenty of men's options at other stores, and on the internet men's choices are also plentiful. I buy many items from Prevail Sports and I know more men's internet stores have been mentioned in other forum posts.
And FACT: they are designed for "male plumbing" so they fit much better than women's underwear. GGs understand this, why can't you.
Wearing women's underwear, if you are a man, is not about fit or fabric or cut as those options are all readily available on the men's side of the aisle.