Boyfriend getting a female roommate... struggling to accept it, am I wrong?

Boyfriends roommates are moving out (couple), and they were responsible for looking for a new roommate, needless to say they put little to no effort into it, and only had one person interested, a young, attractive female, obviously they don't really care since they're not stuck with it. My boyfriend wanted a male with similar interests and posted his own add, but not much came of that, and now the female has gotten the room and is moving in a few weeks.

Am i wrong to have such an issue with it? we've discussed it, and he just keeps end up saying there's nothing wrong with it, i shouldn't have an issue with it, but regardless of whether she was attractive, younger, older whatever i would still have an issue with it. He thinks I'm being insecure, i just don't see it as acceptable. I've told him i'll attempt to be okay with it, meet her etc etc but the likely hood of this happening and me liking her and not constantly wondering if she's running around with little to no clothes on, isn't exactly what i call ideal.

genuinely seeking honest opinions
Boyfriend getting a female roommate... struggling to accept it, am I wrong?
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