The word in Proto-Indo-European *pes means penis. The other word "fæsl" means (according to oldenglishtranslator.uk) "seed [or] offspring". I can kind of see what the relationship could be (changing the p to an f, and sexual reproduction). Is that theory correct?
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Cognates, according to this en.wiktionary.org/wiki/Reconstruction:Proto-Indo-European/pes- – jk - Reinstate Monica Feb 27 '20 at 18:23
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Changing a PIE p to a Germanic f is entirely consistent with Grimm's Law, cf. Latin "pater" and English "father". – Robert Columbia Feb 29 '20 at 3:02
Probably. Nothing's ever entirely certain when it comes to reconstruction, but comparison with Latin pēni- "penis" < PIt *pesni-, Hittite pesna- "husband", Sanskrit pasa- "penis", and so on are pretty solid evidence for the PIE root, and PIE *p > PGmc *f word-initially is a famous and uncontroversial sound change.
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1Makes sense. I go it from Rebecca Monica's wiktionary source as well. – Number File Feb 27 '20 at 22:24
