Can STD go through underwear?
There is no way that a pathogen that causes a sexually transmitted infection could possibly survive in the environment of panties – let alone panties that have been sent through the post. These germs evolved to live in warm, moist people, not on cool, dry fabric. No risk here.
Can STDs survive on clothing?
Most sexually transmitted diseases (STDs) cannot be transmitted through clothing. However, some such as pubic lice, scabies and molluscum contagiosum can be transmitted by sharing clothes with an infected person.