Male = relief zipper
Female = zipper with an FUD or the drop seat. When I had a dry suit I preferred the drop seat. I was on a raft so the big butt zipper didn't bother me. Some female kayakers say the zipper is uncomfortable in a kayak?
I have the Kokatat women's GMER with the drop seat and love it. I am so happy I purchased the drop seat over the front relief zip. Apart from when I am putting my kayak skirt on, I do not notice the butt zip. My comfort in a kayak is not compromised at all. The dry suit is very roomy on me so maybe that helps.
The two ladies I know that have the butt zip hate it. The only reason I know is because I've heard them complain. Apparently that is a hard zipper to zip in an awkward location. They may not lube it however.
Standing up to pee is really awesome. Get a FUD, practice in the shower, and let that help your decision. Remember, there is always water to wash the FUD when boating!
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