I've had the same issue as OP once. I wanted to go down on this chick but she stopped me...Now some may think it was her being insecure about her hygiene, but she smelled fine and she knew it because wouldn't have been fooling around if she wasn't. I believe she'd been messing around right before we started going at each other and didn't want me to be where another man dikk has been.

..I got a strong feeling about this because she'd watch oral porn but wouldn't let me go down on her for the 8 months we've been together.
She was fukking other dudes...