Just to be yoytzeh the forum description of “shver sugya”…
On daf lomed hay amud beis in Kidushin (http://e-daf.com/index.asp?ID=2697&size=1)
Tosfos D”H Lihashcosa asks why the gemara needs a gezeira shavoh, when we had a diyuk in the pasuk before. They answer that the diyuk is only good before we gave any chashivus to zaken isha.
Why is the gezira shova better than the diyuk? What’s the problem with the diyuk even with the chashivus?