abortifacients / contraceptives?

I think it'd be fine for a character to experiment with contraceptive methods, particularly ingesting various herbs to alter hormone levels. (I'm also thinking about super disgusting stuff, like using animal intestines as condoms -- maybe not that...) A lot of it would probably fail and/or have weird side effects but I think that seeing a toon research and experiment would be fascinating as well as reasonable.

Intestine condoms would probably require opposable thumbs, thank the good lord. Please stick to semi realism for at least that, y'all. *grimace*