why are girls more picky about who they sleep with?

in general men seem to be ok with the concept of sleeping around / having sex with many girls but girls on the other hand are more reluctant to do the same. of course there are social reasons for this. reasons such as the social domination of females by males. if we look at the world right now, we can see female sexuality which changes a lot from one part of the world to another depending on how "evolved" the society is. you would see much more sexually liberated women in countries which rate the highest in gender equality.
but there are also evolutionary reasons for this difference in this behaviour between the genders. the reason is that when a women would mate and get pregnant, it would take her atleast 9 months to 1 year to be able to have an opportunity to make that choice again. the male on the other hand can make that choice of choosing his new mate in a matter of few minutes. so, every time she has sex the female is making a choice which has a much bigger impact on her life compared to the male and hence she would always act more choosy. but this evolution happened in the our long history when we didnt have condoms and other birth prevention tools. given how easy it is to avoid pregnancy now, i think this evolution would roll back and we would see similar lack of pickiness from women as we have seen from men for so long

why do guys want to have sex with a lot of girls

guys are always seen as assholes who would do anything to get into a girls pants and as many pants as possible .. but why is that .. why is this massive urge that guys have to have sex ..

for any specie to survive they have to have offsprings .. for them to have offsprings they need to have sex .. it takes 9 months after the egg is fertilised for the baby to come in the world .. so the female is booked for 9 months once she's pregnant .. the guy on the other hand is still available to mate .. now assuming evolution works and it dictates that the best genes are passed on to the next generation the most efficient way of doing this is to get 1 out of say 10 males' genes to pass on with 10 female genes .. so 10 guys fight it out, 1 of them (the strongest gene) wins and then he gets to "spread his seed" to get to the next generation .. the males are hardwired deep down inside to win the race and have sex with as many girls as he possibly can .. this is how we survived in the past and it will take a lot of time to get over this hardwiring (the monogamy is a very recent phenomenon).

hope this helps some girls see a reason to forgive their boyfriends when they catch him sleeping with some other girl .. its not his fault .. its evolution !