I’m straight married and have been wearing thongs regularly for over 10 years, I started wearing thongs since 2003 though. No issue from wife also.
My preference for thongs is the ones with narrower side (< 1”) and enough pouch for my package. Not a fan of larger pouch due to my balls frequently retract inside and to fit I must wear cock ring.
I used to prefer dark colored thong before but now like to wear bright colored or with pattern.