The first time a woman has sex, it is possible to cause redness and swelling in the vulva and vagina. The first time sex, if the two sides of the sexual knowledge is not enough, the female psychological tension, there may be less vaginal secretion, or even vaginal spasm occurs. At this time, the man forced insertion, there will be a certain chance to lead to the woman inside and outside the vagina due to friction resistance and damage, or even vaginal tear bleeding occurs. If the male partner has an erection for a longer period of time, there will also be redness and swelling due to non-stop friction. Therefore, it is recommended that both parties fully stock up on sexual knowledge before sex, and patiently carry out foreplay to relax the female body and mind. Can also assist the use of lubricant into, to avoid the occurrence of injury due to insufficient secretion of fluid, can also effectively reduce the possibility of redness and swelling of the pubic area.