Her 68 position is about fulfilling a woman’s desire by giving her oral sex without her returning the favor. At least not yet. The man lies down on his back, while the receiver gets on top of him facing upwards and in the opposite direction, straddling her legs on the man’s head while settling her head in between the giver’s thighs.
This position is advantageous for the woman, as all she needs to do is take the pleasures given and focus on her own sexual fulfillment. The 68 Her position is all about the ultimate satisfaction of the receiver from the oral sex.
A woman is typically much lighter, so she can rest her full weight on top of the giver and just concentrate on the wondrous pleasures that she is feeling.
However, it is important to put a pillow under the man’s head in order to avoid neck strain.