Why are there so many more mermaids than mermen in legends?

Why are there so many more mermaids than mermen in legends?

Here's a theory I came up with: mermaids are humans who have sirenomelia (a conditions with conjoined legs) and a skin condition that causes scale like patches of dead skin to grow on their lower body. Sirenomelia is normally results in infants being still born but the form that mermaids have is most often fatal in males but rarely in females (hence the disparity). There aren't enough mermen so that's why they go for sailors.

Or maybe mermen are just more elusive?

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And the reason the kind of sirenomelia merfolk have is more often fatal in males is because of the differences in the way the pelvis is shaped.
Why are there so many more mermaids than mermen in legends?
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