I have been doing more hiking than biking. Hikers deal with chafe and raw butt but usually have no effective solution. I found that crew shorts work well hiking and surprisingly well and cheap for bents. I have a couple different ones. I like these because there are two small pockets on the thigh where I put stuff to easily access when backpacking. Most are 10-15 bucks a pair. Much better breathability in the nether.
SILKWORLD Men's Compression Shorts Pockets Sports Running Tight