Is it bad to sleep next door to a male roomate?

my sister is moving out and she just went to visit an apartment which is shared with another man. Her room is right next to his room. Both rooms have doors but no locks. During the visit, he asked her " you're not bothered by the fact that your room is right next to mine?" She replied "no". Should this be something she should be concerned about? Or are we just paranoid?

Is it bad to sleep next door to a male roomate?
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