from time to time I penetrate her with my finger
There is a painful condition that causes your fingers are. If you insert a clean finger into your vaginal. Now, it seems to me that your fingers or hands to sexually stimulate the vulva, vagina, or the anus. You might want to use your fingers, for fuck's sake, don't make her feel like she is getting molested. If you're having sex, you're at risk of getting gonorrhea.