Sex and period?

Ok. I feel like this is TMI. We was having a talk about sex and I was sayn how I am always so horny when my period goes off and I wanna jump my mans bones But my friend girl said she had sex when her period on and I'm like eeww 🙊😱 That's a day of cleansing. But outta curiosity.. Do ppl really have sex with their period on?