I don't know why, I just think they'd be good friends, more likely post-marriage though they'd be close.

Their both thieves

Aladdin and Naveen are womanisers and have had plenty of girlfriends before they met their true love (Aladdin makes comments about his previous girlfriends in Aladdin: the TV series). So they'd have lots to talk about. But they'd have to do it in private. Jasmine would blow a fuse if she heard them talking about any girl except herself and Tiana.