how safe is OWO?
for the bloke it depends on how many sores, cuts, lesions, spots or ingrowing hairs you have on your dick, and whether the girl has pox, clap-throat, oral chlamydia or herpes.
Herpes can lead to penile cancer, though the risk is reduced if you're jewish or muzlim.
Now fuck off and find a medical reference site which specialises in STIs.