The news is full of sex abuse scandals in Southern Baptist and some other fundamentalist churches. Seems like the fundamentalist churches are more vulnerable to this than liberal churches. When sexuality is strictly pushed under the carpet and repressed, it often finds a way to spring out; like a spring recoiling.
Another factor might be that folks, who have trouble controlling those emotions, are often drawn to stricter teachings as they attempt to use the strictness in their struggles against temptation. Maybe some of those people would flounder even more in liberal environments as they need the stricter limits to try and contain themselves. They occasionally slip up, however.