So you know to experiment, and you know to pay attention to your partners' reactions. The key to taking those hints and developing sexually with your partners is, of course, interpretation. You need to be able to interpret those reactions to figure out what works and what doesn't. If you've gotten past embarrassment and are able to talk openly with your partners about sex, then there's not much guesswork involved. But even a simple moan could mean "do that again" from one person, "ouch" from another. If you're comfortable talking during sex, you can ask if your partners like what you're doing, or ask what they'd like you to do next. You can also ask them to masturbate for you so you can see not only how they like to be touched, but what sorts of positive reactions you want to elicit. As you become more experienced with a partner, you should learn to read each others' reactions clearly. Remember to send clear messages, be vocal about what you want, and encourage your partners to do the same... that way, there's less left up to interpretation.