Sforno on Genesis 12:11/ספורנו על בראשית י״ב:י״א

1כאשר הקריב, close to the time when it became necessary to take such precautions, so that he would not forget.

2לבא מצרימה, a country which was equivalent to a giant brothel. This is mentioned even more forcefully in Ezekiel 23,20 where the prophet describes the carnal attitudes of the Egyptians as אשר בשר חמורים בשרם, וזרמת סוסים זרמתם, “those whose flesh is the flesh of donkeys, and whose sperm is the sperm of horses.”