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 TBDRAWER
Shop Body Aware
Kiniki - Save 10% with the link
Shop Kiniki
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