First off thong tan lines are amazing second off i only like natural sun to tan my skin and thirdly i love to sun my buns at the beach! I thong it up for sure. I make it look good. I love the freedom. All the rest i dont think about. And i do it for the tan.
Married man here. I wear men's thongs more often than not the skimpier the better for me. I'm in my backyard now as I type this working on my tan in a thong. I wear them running under my compression shorts for even more support than what the compression shorts offer. I like the covermale pouch enhancing the best, they are the most supportive and I forget what I'm wearing with them. Any other none supportive underwear I wear I always find myself reaching to adjust the twig n berries or they bunch up and are completely uncomfortable so thongs are my number 1 choice anymore!
Thongs are the only style I'll wear for tanning. If I can't tan in a thong I won't tan!!! In appropriate surroundings I'll wear the smallest suit I can, that's either a 'Towie' style one-sider or a slingshot.