agree with kelse. Yes. Particularly if you are shaved and your partner is not or is but there's that growth where it is so short that it hurts when you touch it (shavers will know what I mean)
The pubic area (directly above the vagina and penis) does rub together when having intercourse so there is friction there as well as inside the vagina.
Try to keep up with your grooming (and have him do so as well). This can really put a damper on your sex life.
Yes. Also could be razor burn