Why don't the pretty ladyboys do hardcore?

[Guillaume]

With a few exceptions we are looking at pretty ladyboys who only go as far as a solo ejaculation. I had assumed that for many their full-time occupation was penetrative sex. In which case for a little more money they would go further, just as they would for any other client. Is it the photographers who not want to shoot this, or are the ladyboys just more chaste than I had imagined?