Ok, tons of people bitch "oh, this guy thought he was so great at oral sex, but he was a slovenly bore" or "man, she was terrible in bed". So, most of us don't come programmed with the instant "perfect lover" mode. And yes, some people just need to learn something, and there is a lot to say for personal taste as well. Some like it rough and wild, and if you aren't you may be considered boring. So does coaching or telling a lover more of what you like help? Have you noticed people open up or try new things, or do they stay in the same rut?