Is there a guide somewhere how to get all the traits naturally in the game?
If you search this thread for "traits" there's a few listed, and the wiki has a couple, but some triggers are broken (such as for "Skins Only"). Many are from either treatments at AMI or from encounters on Z Cup Island. Itty Bitty Committee is a random proc from the posters in the bus stations, and the ones for extra sensitive breasts and compulsively touching breasts are from washing breasts and checking them out in the mirror, respectively (less random proc, but increasing chances with each repetition).
