What Causes Dryness Of Vagina?

hey, me and my boyfriend have been trying to have sex but my vagina isnt getting wet anymore he thinks its because of him, but i feel the same way but cant get horny hes tried using oral and other things but its not working, leading to painful sex which makes things awkward. i used to be very, very horny and get wet by just kissing but now NOTHING works help !!!!