Guys, Is there any innocent reason for a man to ask a woman what she'd do if he raped her?

The guy who asked me this was my flatmate in a foreign country. 20 years older than me. Asked me out of the blue after sharing with me for a year and then moved out less than 3 months later (after I had told him what I would do). He was stone cold sober when he asked and we were not discussing anything at all that could lead to that topic. When I asked him why he'd asked he said "I just wondered" and I was too chicken to press further.

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I can't think the question was 'precautionary' (what kind of rapist does a victim suitability survey?). Does a man who asks a question like that -and then moves out right away- have something on his conscience? Are men ever innocently curious about how a female friend would respond to being raped by them?
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I'm not asking if you guys personally think it's an ok question to ask, we all know it's not, just if there's any reason you can think of why a man you know might want to ask, even if it's them being insensitive, just one reason that doesn't involve a guilty conscience.
Guys, Is there any innocent reason for a man to ask a woman what she'd do if he raped her?
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