You can masturbate each other at the same time. If you are attuned to each other's responses, it may even be possible to reach a simultaneous orgasm, or if not, take it in turns to satisfy one another sexually. Or you may only want to take the arousal level so far with your masturbatory motions before progressing towards other forms of lovemaking. Lie close to each other to have skin-to-skin contact, but position yourselves comfortably so that you can easily touch and stroke each other's genitals.
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