In this position as well as many woman superior positions, the female can control the angle of penetration to suit her needs. From here she can direct his penis to hit her g-spot as she moves up and down.
The male can help with the rhythm by gently pulling his partner in and release her as she moves back and forth.
With his legs in the air, the female is in total control as she can also enjoy the scenery.
If the female wants, she can place her hands on his shoulders or can also engage in extra stimulation by caressing her thighs and clitoris.