No. The actress is the sole proprietorship business and the customer is the porn company, in this example.An actress is an employee, not a customer. She can choose not to work for a porn company. There's no problem with that.
You aren't even in the right ball park here.
The company, on the other hand, can't refuse to sell her porn because she's a woman. Or because she's Jewish. Or latino. Similarly, the company cannot refuse to hire her because she's Jewish, or latino, or a woman. (although porn isn't a great example, because it would fall under the Bona Fide Occupational Qualification exemption. A female role, whether in adult films or the regular kind, needs to be played by a female so the business can in fact refuse to hire men for that particular position. get it. position?)