me 35 y male, married, with two children. i have homosexual relation with my college friend from college hostel. we studied and settled with good jobs, we both married too and having children. since beginning i am in receptive role, so my friend use to fuck me anally. since we are in same city, and having family friendship, we manage to have sex 3 -4 times a week, our wives dont know our relations. we act like friends normally, and in private me take my place of his wife. i want to know that having regular anal sex, could it be any problem for me in late age of my life? can it be cause of anal cancer? we both are clean, we both are not having homosexual relations with anybody except each other. i never feel pain during taking him in me, please advice.