Well, not scientists, but lots of ordinary couples want to try masturbating together, but never do. You can watch various lewd videos in order to “jump-start” the sexual drive. Then you look at each and go at it!
Benefits
First, you can refer to some of the most popular videos starring the best pornstars out there. These girls surely know how to have fun, and they can introduce you to the new and so vivid world of unorthodox sexual practices, among which are anal sex, DP and deep-throating.