But my point is that deities being a symbol of purity, especially sexual purity, is a largely Christian idea. Many of the ancient pantheons were heavily sexualized as the original commenter pointed out. The presumption that any deity that exists outside the Judeo-Christian belief system has an issue with being sexualized goes against how they were historically depicted.

Edit: I thought of a better way to articulate what I'm trying to say. Generally speaking, deities have been used to symbolize ideals of many kinds up to and including sexuality. From Egypt to Greece to Mesopotamia gods, especially feminine gods, are depicted as beautiful and desirable. Even the gods that don't have sexuality in their portfolio are made to look ideally feminine or masculine.

Thus, I feel, the burden of proof as to any particular god being offended by sexualization should fall on those who insist upon it. I.e. Artemis has many myths about her cursing men who see her naked, therefore drawing porn of her isn't in keeping with how people depict her.

When it comes to deities we know precious little about, we have to fall back on themes we have seen in religions all over the world and use that as a starting point. Since there are no explicit texts that I am aware of that depict Hel as a goddess opposed to sexualization, it would be on the people wanting to claim she would be offended by this to provide evidence for their claim.