Why do girls keep staring at my dingle dang?

ok I'm like the popular guy in my school and have a girlfriend and I'm sexually active with her and have been in the past with other girls. I have been told I was hot a lot of times b4. I have long black scene hair blue eyes and am muscular with a 6 pack and im on the football teem. I have a sortof a big peter like 7 or 8 inches hard and 4 or 5 soft. Im 17 kind of tall 6'4" or 5". But like girls all the time will stare at it and when I catch them they turn away very quick and sometimes girls will like "accidently" brush there hand against it in the hall. I don't mind but its kind of annoying happening everyday at school how can I tell them to stop?