OP, it's just not worth the effort, I'm a sociologist, and paying a professional to make up a survey, implement said instrument, and then have them examine and interpret the data after that, is costly. From what Bryan is saying, it is costly to implement censorship and toggles to begin with. It looks like Bioware would put in capital, and not make a profit out of it. I think that the majority (not all) of the people, who would be against nudity in games, are not the type of people who buy video games in the first place. So your idea is not marketable.
You are advocating a type of censorship, and I think it is rather dubious. This is why I think what you are saying is dubious; nudity is not inherently sexual... Neither is being clothed, yet there is clothed heavy petting. So any arguable peeve that you have must be with sexual intercourse itself. Well intercourse is not actually depicted in Bioware games, it is only ever implied, what we see are either pg-13 'sex' scenes (edited rolling around, or simple caressing; the Jack scene in ME2 was so ambiguous that fans argued that her and Shepard only 'made out' before the Collector's base), or a purely fade to black type of deal. Bioware has never even depicted exposed genitals let alone copulation in their games. At most, we see an exposed nipple, or the side of a buttock, both of these things are not inherently sexual, what they add is a small layer of realism, because people who are in a romance, and who desire one another, usually get naked when they make love, or have sex etc. So again, the act is only implied. I would like some clarification OP, would you really accept the scenes if the stray nipple, or buttock had some layer of cloth put on it? Or would you want the scene removed entierly?