Anal Bleeding when having a bowel movement?

My boyfriend wont go to the doctor and I am very concerned. He has been bleeding when using the bathroom for the past 2 weeks or more. There is alot of blooding the toliet and on the tissue paper. He says that it is painless, therefore he will not got to the doctor so the they will stick something up in him. I dont know what to do but i am scared that it is something that is harmful to his health
If it makes any kind of difference he is 18 and a very active football player
No he definitely isnt Bisexual