For guys, what is the best way to clean yourself after sex to best?
No brainer. Jump into the shower. Condom will do great job protect from infections entering the penis or vagina. A nice hot shower can spray away all unwanted matter away which wiping can leave behind. However your best way on not contracting an STD is by sleeping with limited partners and or a regular partner you know and can trust. This way you won't have to race for a hot shower immediately after sex.