Unless it was an extremely strong relationship, I would recommend not to because it would be a bit inappropriate.
The general consensus is that they have problems
To keep men's huevos warm and cozy. And womens pán warm!
Yes a lot of men do secretly wear womens underwear, but they do not make it known to others for fear of being being harassed by other men (and woman) and being seen as weird. Some women do like their partners to wear their underwear during sex to make it more exciting. Some men simply like to wear womens underwear due to the risk of being caught and the thrill it gives them or simply just like the feel of it under their clothes. Most men won't admit it but at some point they have tried wearing womens underwear.
Thetoyboystore.com
just wear womens
i wear mens size large underwear and i can wear womens size 7 or 8 but 8 is more comfortable
Anyone can buy underwear for anybody. They might look at you strange in a lingerie shop if you do. Tell them it is for your girlfriend.
They are available at Walmart.
One can buy Figleaves underwear online directly from the Figleaves website. They have both underwear available to purchase for both men and women, as well as many other items such as swimsuits and lingerie.
It is a thin and smooth, thin, lining in running shorts that act as underwear for both men an women. It is a thin, smooth, breathable lining in men and womens running shorts that adds support like underwear, yet more comfortable for long distances.
There are many good shops for customers to buy designer underwear. The most popular ones are probably Hollister, Calvin Klien, Ralph Lauren and Superdry.
There is a large variety of places online where one can purchase men's thermal underwear. These places range from stores like Canadian Tire or Target to eBay.