My gf has had problems with warming liquids making her itchy in the past so we've never tried them. Which of your products would be least likely to cause an allergic reaction?
All our warming lubricants contain food grade menthol, which actually goes on cooling, and warms with friction.
Food grade menthol should not cause any allergic reactions, but some people tend to find the sensation off putting or too intense. I would recommend buying samples first, and find out which product works best for you.