What is the proper use of a condom?

Condoms are used to help prevent pregnancy. If the condom is lubricated the male would slip on the non lubricated side, if the condom is not lubricated then it doesn't matter how it is put on. You should put the condom on whan your penis is fully erect. It is said that if you're trying to prevent aids the best one to use is latex for better chances.