What is ual ? is it painful for girls? is it pleasurable for girls?

my clmates say that is painful for girls. because of that, i'm scared to have a child. but they also say it's pleasurable. how could it be? i don't really believe them, because they know i'm innocent, and they like to make fun of my innocence by twisting up facts about . a lot of my clmates talk about in group discussions, and i can't relate because i know nothing about it. my clmates are not horny, they found out about these things by reading, and not videos. they told me it's not good for a girl to be innocent, because lots of guys out their are looking for a prey. i want to learn about it without their help. will someone please help me? i am serious.