A method is the mutual loyalty. But even this, to heed the statistics, it appears to be practiced by a few. If zymax   you have doubts about the loyalty of the partners better to ask to use the third method, a condom. 3. Condom. If the first two methods fail, the last dam to sexually transmitted infections is entrusted to the condom, a latex hood that prevents contact between the genitals. It is to be worn before starting sexual intercourse.

http://www.healthwisesupplements.com/zymax-claims-better-longer-intense-sex/