Should we have sex? Help?

This girl and I have been good friends for about 2 years. Well recently she came out and told me she likes me. Well i was excited and said i liked her too. We have been talking. And the other day she sent me a picture of her in underwear and a bra. and i told her i liked it. and he had been talking about sex. but the thing is...she is moving across the united states in about a month. I want her to be my first but since i will never see her again should i not do it? Thanks.