Hello Thanks for your query,based on the facts that you have posted it appears that you have what is called as Phimosis. During intra vaginal sex foreskin is retracted over glans penis making it possible to penetrate vagina.It acts like a sleeve during to and fro movements during sexual intercourse giving sense of pleasure and sexual satisfaction . When there is Phimosis penetration of vagina is painful and may cause bleeding due to forceful penetration.. Please consult qualified General Surgeon for clinical examination .You need to get circumcised .This is a simple surgery done under local anaesthesia as a out patient procedure and offers permanent cure to have enjoyable sexual life. Dr.Patil. and there is lack of pleasure sensation