Trichomoniasis (aka trich) is the most common curable STD. Millions of people get trich every year. It’s caused by a parasite that spreads really easily during sex. The parasite is carried in sexual fluids, like semen, pre cum, and vaginal fluids.
https://www.plannedparenthood.org/learn/stds-hiv-safer-sex/trichomoniasis

