they aren't unhappy, slavery was less hard then in Rome.
Your difference is correct for males: male slaves build pyramids.
But female are both servants and slaves: many female were captured in the war, like spoils of war. And they are used in the house; they stay naked or seminude, but it is not an humiliation like Rome. Nudity in a hot country is common; nudity for slavegirls is only a marked status
Plus one more thing, I studied ancient Egypt history and these girls here aren't actually slaves, they are servants! In ancient Egypt there was a huge difference between those two ''proffesions''. Free Egyptians could become a servant, it was similar to todays housekeepers and personal helpers. They cleaned the houses, helped their masters to get dressed, doing their make up, hair etc.