Can dry humping with clothes on or oral sex irritate my vagina? we didn't have vaginal intercourse but now my vagina itches. is this a uti?

Both: "dry humping" and oral sex could potentially cause irritation of vaginal tissues. Vaginal itching is sometimes a symptom of a yeast infection.

Absolutely. : Friction to pelvic floor is irritating. Roughing up skin & membranes is an open invitation for germs like yeast & bacteria to party on. Oral sex compounds the problem. To put things in perspective: we don't treat dog bites with antibiotics, but we absolutely treat human bites with them since the human mouth is so dirty. Try OTC topical metronidazole & both of you wash genitalia & brush teeth well.