First thing is to join the forums and join in the conversation and also comment on the blog. The more points of views on the topics the better to inform others that may not already be into the against the norm underwear, swimwear, etc.
Here's some ways to support doing what you probably already do. Shopping for stuff! They all give some affiliate kick backs.
Body Aware - Save 10% off with code TBD2014
Shop Body Aware
Undies for Men - Save 20% off with code TBDRAWER
Shop Undies for Men
Amazon - no saving, but I can potentially get an affiliate commission if you use the link
Shop Amazon
Kiniki - Save 10% with the link - they no longer seem to do their affiliate program, but the 10% code seems to still work. Let me know if it doesn't and I'll remove this one.
Shop Kiniki