Condoms themselves appear to have quite a rich and awesome history.
But here at the Ripsaw we're always cutting towards the future, and even in the realm of prophylactics, there's new science to be found.
First off is this 'molecular condom' research coming out of Utah. It's a rather clever piece of biomedical engineering, using hydrogel polymers that can switch from liquid (for application) to a solid (for while being unused in the vagina) and back to a liquid (when in contact with semen). Hydrogel polymers can absorb an amazing amount of proteins and liposomes. We use similar material in our lab to stamp glass slides with lipid bilayers, which in execution isn't too far off from how an ejaculation might ink this stamp.
South of the border, they seem to have hit upon a similar idea using algae as a starting substrate.
Could be creepier, I suppose. The alternative is perhaps a later model of the Sperm Cube.