She has always wanted me to ejaculate inside of her, but I will not. The gap is so large because of the differing levels of consistency when using the spermicides. The twenty-one percent rate also reflects factors such as age and frequency of intercourse, whereas the three percent rate is simply based on broad laboratory studies.
Consistent use is the most important factor in minimizing failure with spermicides.
Spermicides increase one's protection against gonorrhea and chlamydia, but are NOT a protection against all STDs, including the HIV virus. In fact, there have been studies showing that the spermicide nonoxynol-9 may increase the risk of HIV infection. To increase contraceptive efficacy as well as to protect against STDs, try combining spermicides with condoms. They can be used by the woman without necessitating partner involvement. They can be kept available for immediate protection whenever needed.