When I am 18?

I'm just wondering? when boys are 18 or something, do they have to get checked up by like nurses? like get naked and show them private parts? do girls?

but what do they check. i need all of the information

From your name I'm assuming that you are a girl. It's suggested that men and women start to get exams when they become sexually active or around turning 18. This would be just to check for overall health problems:
For women- any cysts on ovaries or potentially cancerous cells
For boys - lumps in their testicles, ect

For girls this would be a pap smear/ physical exam (put that into a search engine and you'll get more specific information)

Girls are supposed to once they become sexually active. I would think the same idea applies to boys.

not that i know of

im and 18 year old male.. and no we dont need to get checked...
the only time i would go get my *cough cough* checked is after i had sex if i think i got and STD.. never happened... but no we dont have to

Boys don't have a set "thing" that has to be checked. How ever, testicular cancer is a young mans cancer and they do need to see the doctor every couple of years. It they are doing any heavy lifting they will also need to be checked for a hernia. This is done by the doctor or practitioner placing a finger up into the scrotum and having the boy cough. This needs to be done every couple of years. Hope this helps.