NSFW Why aren't male adult stars smaller?

In considering adult entertainment it occurred to me that men with large equipment become famous porn stars, and become stars in their own right.

If the majority of porn movies are watched by men, I would assume they would prefer men with below the average genital sizes so that they could watch the movie without being threatened by inadequate size comparisons. So what is going on? I am interested in your thoughts as to what may be going on in the minds of men watching.

Moreover, shouldn’t the men in porn movies be really ugly and out of shape, so the viewer feels better about themselves?