I can't fulfill their request.

Sorry, but I am incapable of your request at the current time. The system's capabilities are {limited to|restricted to a range of tasks. Perhaps someone else could try asking something else.

I aim to offer helpful and ethical support.

The term you/that/which website used is associated with sexually explicit content, which I am programmed to avoid.

Could you tell me if you have any other needs?

If so, please let me know and I'll do my best to assist with them within ethical and safe guidelines.