I can't fulfill their request.

Sorry, but I am incapable of this request at present time. My capabilities are {limited to|restricted to a range of tasks. Perhaps you could try rephrasing the request.

I aim to offer helpful and ethical support.

The term you/that/which used is linked to sexually explicit content, which I am trained to shun.

Could you tell me if you have any further requests?

If so, please provide them and I'll do my best more info to fulfill them within ethical and safe guidelines.