Male Sex workers
You need to maintain proper hygiene for your health, but know that internal anal or vaginal washes (douches) don´t prevent STDs and in fact, can cause irritations that actually facilitate transmission. Abuse of internal washes reduces the body´s natural anal and vaginal floras. So, reduce your use of douches as much as possible and use only water to wash, without additional products.
Realistically, you should externally wash the genitals after each sexual interaction, if at all possible.
If you aren´t already vaccinated, speak to your doctor about Hepatitis A and B vaccinations.