spermicides kill sperm before it gets to the uterus to find and egg to join with the make foams/suppositories/ films. I and as many ppl as I have contact with use the Films. One in the condom One i the vagina, while making out then one when it is done , never wash it out. let it do it's work over night an it cleans its self out naturally. IF for some reason you do not wear a Condom [sheer stupidity] then look for your nick name to change to DA-DA. Rythm is made for large families of Catholics, even the flandering Clergy use condoms when they pork parishiners. It's a game of Russian roulette played with 20 billion loaded zygote and one egg. Serious sex is seriously impregnating. wrap it or don't tap it. use spermicide every time no mater what other method is used. cunnilingus requires no such precautions and sends her home with a smile onn her cheeks.

The rhythm method of birth control is what you are seeking. Basically, your wife plots her cycles on a calendar. Ovulation (egg release for fertilization) usually occurs mid-cycle. Several days prior to mid-cycle & several days following mid-cycle practice abstinence. Here is a link for more specific details: http://www.medicinenet.com/natural_methods_of_birth_control/article.htm Also, if you continue to read the other pages on this topic you will learn other methods for determining when ovulation occurs.