Waited until marriage for sex and now it's not good

Asking for a friend. My bff has had a few sexual partners in her life, with only one long term boyfriend helping her to find sex enjoyable after almost a year of trying different things. She met the man of her dreams who wanted to wait until marriage for sex. She thinks some of this is do to religion, but also due to inexperience and a previous bad experience with a woman. They barely messed around prior to marriage (no oral sex etc) Now, they are married and the sex isn't good. He doesn't always ejaculate and she says it's painful for her. He doesn't want to talk about it and sort of doesn't think it's a problem. Neither really want to have sex (cause it's not good) but my friend thinks it's important for them to make it a part of their relationship now. How common is this kind of thing? How do others get through this?