Asking advice: Gloryholes

Hi, I've been wanting to suck cock lately, but am afraid of doing it and getting caught by my girlfriend, or by chance finding someone who knows her (she has quite a few gay friends)

I suppose my thing is are gloryholes disease cesspools to avoid at all costs, or might this be a way to discretely get this fantasy off my chest?

Well, everything's a crap shoot but I've sucked off my share of cocks that were sticking through glory holes and have never gotten an STD yet.

Well which is worse, getting somehow caught or catching an STD and giving it to your gf? Talk with your SO and she might be OK with it..