The deep penetration and large hip thrusts of the missionary position can cause the man to reach orgasm quickly compared to other positions, which can be problematic if the couple seeks to reach simultaneous orgasm. The male reaching orgasm first can be disruptive to sex, as 50% of penile erection is lost immediately after ejaculation, making him more likely to inadvertently slip out of the vagina, especially during the strong pelvic contractions of female orgasm. In addition to the standard methods for treating premature ejaculation, Zachary Veilleux notes that this problem can be overcome by workarounds such as changing positions frequently (which studies have shown delays male orgasm by a factor of 2-3), using lubrication to reduce friction (friction stimulates the male but is not as important in female orgasm), or switching to cunnilingus for a while when close to ejaculation, and then switching back when ejaculation is no longer imminent.