There's been plenty of talk of infidelity on here. I was lucky enough to never have caught anything from my ex's indiscretions and, thankfully, have had a monogamous partner since before HIV/AIDS came on the scene. I cannot imagine how angry and hurt I would feel if that were not the case and I caught something. My daughter trusted someone in her first sexual experience and got HPV for her naivete, before ti was widely known. As a result she lost most of her cervix to removal of pre-cancerous cells causing her to stay in bed for 19 weeks whilst pregnant with her twin sons.