Although this post is almost 2 years old and may not be received by original questioner.I hope it is not too late.
Do not put oil, lotion, or otherwise try to "improve" the smell of your asshole! This will ruin it for your man! You noted that he said he loved your female odors!!! What you don't realize is
1) He is attracted to (sexually turned on by) the SMELL of your ass. This may be enhanced the less spotlessly clean you are there! If it smells like perfume the turn on will be ruined. Many men are attracted to and sexually turned on by the smell of a woman's vagina and asshole.
2) He is likely also turned on by the submissiveness of his act and wants you to "rub his nose in it". He would love it if you laughed or at least giggled at his predicament that he is addicted to smelling and licking your asshole BECAUSE IT TURNS HIM ON SEXUALLY AND A MAN CANNOT RESIST HIS SEXUAL DESIRES. This places you above and IN CONTROL OF HIM! which also turns him on!
3) You should encourage this behavior by forcing him to smell and lick your asshole while you stroke and suck his cock, but don't let him cum. By bringing him to the edge of orgasm and keeping him there by ever so light touching if his cock gives him incredible pleasure...almost as much as orgasming. So, while in this state of bliss if he is kept smelling and tasting your asshole "forever" he associates this sexually hightened blissfull state with the smell if your asshole while (yes the strong smell if your shit). This will addict him more and more to your smells (asshole and vagina) such that a whiff of your used panties or a sniff if your croch will give him an instant hard-on.
4) He will strongly desire for you to enjoy this power you have over him and laugh at his predicament and your control. He will love it if you stroke his cock and then push your ass in his face and when he of course starts to sniff and lick your asshole you giggle and sarcastically say "My poooooor baby".
5) If you enjoy this REAL fantasy with him, sex will be GREAT.
Finally, if soon after such a sexual episode he gargles with mouthwash you should have no health problems.
Hope this reply is not too late for you, but if so hope it helps someone else. Finally, the turn on for him will likely be ruined if you talk about it as if it were a game you play. He wants you to actually like dominating him and is turned on that you are sexually in control of him, know it, like it, and laugh at his pathetic addiction to your filthy asshole. But only laugh at it during sex. He likely won't want it to come up or change any other part of your relationship. He may want to be "The Man" and in charge in every other part if your relationship.
Only in bed is he turned on by this "secret" power you have over him.