If you like to go for the positions under the classic missionary type, then the ‘bent and stretched’ or ‘roly poly’ could fancy you.
Let the woman lie on her back and position her legs up, such that her knees are close to her ears. This way, the woman is on her back, while her lower body is slightly lifted.
In this position, the woman has her lower body lifted and the angle of penetration can vary. She could hold her legs up for wider and comfortable penetration, doing this also enables her partner to massage her breasts and clitoris for pleasure. For ease and comfort, the woman can place a pillow under her neck, this will ease any strain on the back as well. As her legs are either bent towards her chest or wide open, she can get a clear view of her man’s attractive chest and muscles.
As this requires decent amount of stretching and bending, women with back problems would want to avoid this. Mastering this position would require some practice and demand strength from your leg muscles. You may also want to try the ‘magic mountain’ position.