why ??

why do a lot of females bash each other for having multiple partners ?( maybe not at once but In total) & also for having sex in their teenage years because they feel as if their not ready for a baby.. I feel like everyone who isn’t ready for a baby should be careful regardless of age. but sex isn’t just for having babies, sex is also a big part in pleasure for you as well as your partner ... what is considered too young to have sex