Can having sex without a condom once lead to any disease? - Quora
Frontiers | Sexually Transmitted Infections and Associated Risk Factors Among Male Clients of Sex Workers: A Cross-Sectional Pilot Project in Antwerp, Belgium
Beyond condoms: 4 more ways to cut the risk of catching an STD | Salon.com
If I have sex with a sex worker but use protection, how likely is it that I will catch an STD? What if I do this once a month? - Quora