I have seen other people on this forum and others dealing with the same issues. Some people with severe abuse as children spent 2 years in sex therapy and were just getting to the point of trying sex, but they were not sure they were ready.

Another issue some people brought up is that without intimacy, sex did not feel as fulfilling. Some therapy is conditioning a person to be comfortable with sex but there is another whole field of enhancing emotional intimacy. There are articles on this.
Psych Central - Search results for Intimacy and sexia;otu

The whole trust issue can limit how much a person opens up and relaxes. There are many issues that could get in the way.