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Lubricant by BioFilm
Uh, I gotta say, if you're having unprotected sex and kissing anyway, there's no other disease transmission that is specifically mouth-genital to really be worried about it. Lubricant itself does not have any safer sex properties.
Another option when it's drying up is to just add a couple drops of water, which will often rejuvenate water-based lubes.
Oral herpes can be transmitted from mouth to the genital region. I also believe, although I do not have scientific proof, only my own experiences, that for women, there is an increased risk of bacterial/yeast infection.