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I don't have particular experience in this area other than know that the technology between the male and female units are essentially the same, what differs is the ergonomic design. There are a number of designs beyond the membrane version, but the membrane version is ostensibly the most cost effective version. I incidentally found this document which you may already know that I found helpful: https://web.iitd.ac.in/~chariarv/WLUResource%20BookFinal.pdf , so perhaps the authors of this are a good place to start.

I don't have particular experience in this area other than know that the technology between the male and female units are essentially the same, what differs is the ergonomic design. design.

There are a number of designs beyond the membrane version, but the membrane version is ostensibly the most cost effective version. I incidentally found this document which you may already know that I found helpful:

https://web.iitd.ac.in/~chariarv/WLUResource%20BookFinal.pdf , so

So perhaps the authors of this are a good place to start.