I understand that hiding information that would otherwise may have lead to a potential partner to deny sex is grounds to consider sex non-consensual. The example I had in mind, and which i kinda referenced, is the presence of an STD. "Would you still have had sex with them if they had told you they had AIDS?" being the exact case I am thinking - the answer (unsurprisingly) was "No" and I do believe that it was grounds for determining responsibility/culpability in a legal case.
Now, Hilgya could argue she didn't know it was relevant information to Durkon - that because she doesn't care, it means no-one should care. But besides ridiculously self-serving (which is par for the course, she's as self-centered as a spinning top), it is a ridiculous idea that she would not be aware of how most dwarves think of the problem, given that she grew in the culture ETA: and as joeltion points below (thanks!) she did know this might be an issue, since she did inquire in advance. So lets add hypocrisy to the list of issues, since she made sure there wouldn't be competition but denied Durkon the ability to give informed consent.
Grey Wolf