So who, outside the extreme fetish community, is offering the equivalent service for men?
Is there an equivalent problem for men? I occasionally suffer from a bit of numbness down there on long rides but nothing lasting, no serious damage. If you do, then maybe castration is the solution for you.
Obviously I can't speak for women's experience first hand but I was talking recently to someone from one of the big bike companies who works with pro women cyclists and apparently this is a common problem, with many of them requiring corrective surgery to deal with painful damage caused by their saddle. He was also telling me about some of the procedures saddle designers use in an attempt to analyse the causes of these problems but I won't go into detail about that here - all I will say is that like cleaning windows, it's a good job for a nosey parker.
You could argue that labiaplasty seems a drastic step for amateurs who are putting themselves through this for fitness/leisure rather than work, but we're talking about the US, where cosmetic surgery is far more normalised generally. You could also question the underlying misogynism in society that leads someone to consider the need to do that to themselves for 'aesthetic' reasons, but telling women they shouldn't be doing this to their own bodies isn't the way to smash the patriarchy.
If you're looking for a male equivalent to labiaplasty, I think perhaps circumcision is a closer comparison - and that is still considered normal in the US too.