"What's mostly not seen by others, but still used to please them even though many men would feel more free without"

Help please!

"What's mostly not seen by others, but still used to please them even though many men would feel more free without"

Help please!
Make-up

What has four legs then three then two then three?

The human life cycle!

Four legs-(Crawling)
Three legs-(Using something to help you walk)
Two legs-(enough said)
Three-(and old man or woman with a cane)
(it took me forever to figure it out!)