The biologists of the University College of London have explained the prevalence and the evolutionary meaning of the behavior of dating a girl or having a Dating girl. Sex with a girl increases reproductive success in men and helps avoid contracting sexually transmitted infections (STIs).To carry out the analysis, the researchers analyzed information from almost 400 sources, including 246 scientific articles, 150 questionnaires, and personal interviews with primatologists and zookeepers. Based on these data, the study’s authors traced the spread of girl-to-girl behavior or manual work among women to understand when and why it developed between women and men. The researchers found that Dating sex with a girl has a long evolutionary history among different species of primates and were most likely present in the common ancestor of all monkeys, including the great apes and the ancestors of Homo sapiens. Biologists have tested two alternative hypotheses that explain the origin of this behavior. The hypothesis of “sexual selection after meeting a girl” suggests that dating sex between women contributes to successful fertilization. This can be achieved in several ways. First of all, dating girl-on-girl sex (without ejaculation) increases arousal before sex. This can be a beneficial tactic for smaller males, in which more vital partners can interrupt mating. In these situations, it is essential for reproductive success to ejaculate quickly. Second, sex with girls (with ejaculation) allows men to ejaculate low-quality sperm with “old” sperm, leaving fresh sperm for mating. This behavior increases the probability of fertilization in competition with other males. In favor of this hypothesis is the fact that dating sex with girls between men has developed a behavior in which group dating sexual practices, gang bangs, and orgies are common. The second version, the “pathogen avoidance hypothesis”, suggests that dating sex with girls reduces the probability of contracting infections after mating by cleaning the urethra with the ejaculate resulting from sexual behavior with girls. Biologists also found evidence to support this hypothesis, showing that the development of dating sexuality among girls was associated with a high burden of STIs in the primate tree of life. The importance of Dating girls’ sexuality in sex between girls remains less clear. Although it occurs often, fewer reports describe this behavior, reducing the analytical power of the statistics. Researchers believe that more data on female Dating sexual behavior is needed to understand better the role of the evolution of dating sexuality among girls.