I have had vaginal dryness recently, and I think it is resulting in cuts in the lower area of my vagina as well. I have found that using a lot of lube helps, just make sure it's water-based. KY has a warming kind that isn't like jelly, but not too watery and messy either. & make sure your man takes it slow at first. Hope everything works out for you.
There are some women who experience vaginal dryness naturally. It is not an std. You will have to discuss some possible remedies with your gynecologist for the dryness. Things like medications you may be taking, or anything that changes your hormones could cause vaginal dryness.