was reading chumash today (ויקרא כז,ט"ו), how esav kept his costly garments with his mother, and rashi explaines: הלא כמה נשים היו לו והוא מפקיד אצל אמו, אלא שהיה בקי במעשיהן
and a thought came to me;
Esav surely loved and enjoyed the physical bodies of his wives, he had tremendous lust and did whatever he wanted, and mistame he spent a lot of time with them, and they were probably smiling, laughing every time they were together - it was mamash amazing, and yet he did not even trust them with keeping a garment!!
and rashi answers "אלא שהיה בקי במעשיהן" - he knew exactly what they were enjoying - non of him, the only focus was how they could enjoy themselves, and since there was absolutely no real relationship between them, he knew he couldn't trust them!!
משא"כ with his mother, although there was no lust at all, but there was a real relationship!