While I agree with sex educator Cory Silverberg's prediction that spray-on contraceptive membranes for men and women probably won't become available in North America for quite some time, if ever, I would love to get all sci-fi with the concept. Flavors, colors, textures, zebra print – you could do all kinds of things with less reduction of sensation than today's condoms provide.
Every so often I wonder why we haven't yet figured out how to make condoms effective yet indetectable.
