I absolutely support more asexual romance options in video games, but unfortunately I think the demand for such things is so small that it's not worth the time investment for a game studio. BioWare, the champion of romances for everyone, only created three romances (that I can remember) which didn't explicitly involve sex, but one of those did include passionate necking.
So far you can romance Shadowheart and Wyll without having teh sexy times - though it's sort of involuntary on Wyll's part, I gather - but I doubt it'll stay that way. Gale's romance is sort-of-but-not-really open to interpretation in that area at the moment (it may be less vague when construction is finished).