My sister and I had a real interesting sexual conversation recently. We talked about basically everything (favorite positions, best orgasms if we used any toys or objects etc.) I confessed to her that when she gets dressed up to go out (she wears alot of really short mini skirts or leather shorts with a bodystocking) and in the summer when she wears her thong bikinis that sometimes she gets me hard from the sight of her. She told me that her boyfriend and her want to make a sex tape. She asked me if I would film them with her camcorder so they came have various angles of them doing it in various positions. I find it kind of exciting even if it is my sister. Should I do it? Im 23 shes 21.