Tbh yes. Dont matter how long they've been together you dont know what she has from her previous relationships. Idc if she gets herself checked every month she dont need to be kissing my child on the lips.
I don't even kiss my step kids on the lips. Or post pictures of me kissing them on the cheek or nothing. I'm not mommy. And I don't try to be. Im here for them 100% and always will be and i love them like my own. But they have a mommy. And I'm not her