I did the math... On campus, I go take a leak, and 5 guys join the stalls next to me. 4/5 guys, decide not to wash their hands after taking a leak. In the 2 hour period, there will be about 20 guys using the restroom, that's 16 unwashed hands. These guy must leave the building eventually, and there are only four doors available to exit from. The guys must touch the door handle to exit, as must you. The chances of you touching somebodies penis, is well over 80%.

Therefore, used bibs / shorts don't scare me.