No insult intended but you must be a very young man , the reason i say your very young has zero to do with sex or homosexuality , the doctor inserting his finger in you is the most serious part of a man's physical examination , the doctor is feeling for an enlarged prostate & intestinal pollops , not allowing a doctor to perform the exam can allow several types of cancer to go undetected until it's too late , by the time you notice symptoms of shitting or pissing blood it's most likely too late
I think it's like around 25 yrs old or so when it's recommended men start getting digital rectal exams , hell who knows ya might end up with a doctor who senses your nervousness & hook you up with a bonus reach around , cancer free & a happy ending !