Here are a couple of herbals touted as aphrodesiac's and the toxcity associated with them (the price of love):
Chan Su or "Love Stone" - A chinese herbal that is suppose to be topically applied, unfortunately all of the instructions are in chinese and those who ingest it will die a digoxin-like death. It has a compound that is essentially a potent digoxin-like substance.
Yohimbine - herbals that contain this can cause priapism - shocker
