I don't think this has anything to do with ph, it's still a penis, it's going to act like a penis. When you tuck it, it sweats, along with that, leakage will occur which stays there. My suggestion is to not tuck, unless you have a huge member when flacid, you really should be able to just position it and no one will no, I've never had an issue and it's fairly large. Also, shaving clean will make it sweat more. Use some poweders and you'll be fine.