Need lots of opinions about a...hobby I've taken up...?

(Male) Okay so I don't know why but recently I have started to finger myself anally, it all started with just plain mas ter bating and then randomly placing my finger on my anus then i started kinda penetrating but not more then a half to a quarter of an inch but it kinda felt strange then i started doing it in the shower and today i just went on my hands and knees and found out how to relax and keep your anus open like the chicks in pornos but mine was only my middle finger big and thats all i was using, anyways when i do this i get stiff as a rock(Erect) so i know my body likes it but i just wanna know the public view of it