Image source: pxhere.com
It is attractive and exciting to watch a girl with a sexy posture that makes her look sensual. She can be dressed, without clothes or in the middle of a sexual act, if she wants to transmit passion and a touch of flirting with a suggestive position will be enough to achieve this goal.
In this photograph you can see a couple having sex and can adapt any position that makes them feel the greatest degree of pleasure, this is very different from the excitement phase through the sexy posture of a girl that can be prior to the intimate encounter or at the end, if you want to leave a personal mark on your sexual partner.
Image source: Position "The Lazy"
It's all about rehearsing and taking advantage of the visual effect that causes a sexy posture!