My BF told me it will feel better for him if I wear a buttplug during PIV?

My bf (27m) and I (25f) have been together for two months, and the sex has been really great so far but now I"m concerned. Last night he told me that when I get really turned on and into it, it feels "loose" for him, and it"s hard for him to finish. He suggested I wear a buttplug during sex to make it feel "tighter."

Is this actually a thing? Obviously it"s all very close together in there, so I can sort of believe it, but I"ve never heard of this in my life. I"m totally open to using anal toys like this if it actually makes PIV more enjoyable for him, but it just seems strange.

Also, he"s shown an interest in butt stuff before (licking, rubbing me there, and two times he fingered me). I"m honestly kind of worried this is some strategy to get me to use anal toys and doesn"t have anything to do with how "loose" I feel. Help?