I love wearing women's underwear during sex

The problem is not to pose the question in terms of normality, the norm being only an indicator of statistical frequency. However, wearing your partner's underwear is not the most represented behavior. The image of the couple still remains socially quite classic, even if the image of the man there initiates a real change in the direction of more femininity.

What matters is whether you're okay with this type of behavior, which it appears to be, and whether your partners willingly share it. You say you use their underwear, so it's good that they enjoy this form of eroticism with you. It is clear that the number one condition of all this is that it is a two-player game where we can exchange.

Also to discover: Focus on sexual fetishisms

I notice though that you talk about making love to "a woman" as if your only source of excitement is borrowing her underwear. As if she were becoming a kind of fetish whose clothes you wear, without there being a two-way relationship since each woman could be interchangeable depending on her underwear...

Obviously, it's a rather solitary form of eroticism, in relation to which the only question you seem to ask yourself is that of your normality. I would rather ask that of your relational loneliness. But if you are comfortable there and if your partners are up for it, why not?

However, by addressing these issues, it can also mean that you are unconsciously tormenting yourself. Having a few clearing interviews with a psychotherapist, who would help you grasp the underlying issues of this behavior and what it reveals about the imprints of your psycho-developmental history, would certainly allow you to see things more clearly.