Sometimes, just from frequent sex, the penis can get chaffed. Sometimes you have a different environment vaginally than his penis can tolerate so yes it could most likely be a yeast infection. Try getting an anti-fungal medication (Monistat or something like that) and apply it to the spots 2-3 times a day. I would wait and see if in a few days it goes away or gets drastically better. If it doesn't, I would get it checked. Sometimes it could be just benign little lesions but its always better to be safe than sorr! I would recommend using a condom until things clear up so you aren't passing this back and forth. That way it will be able to be isolated as what is causing it and what helps it go away. Hope this helps!
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