The best kind of foreplay is the kind that feels good for both of you. There aren’t any surefire moves that always work. What turns you and your partner on will depend on what you both like. One general tip is to try to focus on what is happening in that moment, not on what might happen next. If you think of foreplay as just something to get out of the way before the ‘main event’ you are going to miss out on a lot of pleasure.
One of the signs foreplay is doing what it should is if you and your partner become sexually aroused. Signs to look out for include:
your heart beats faster
you can feel your pulse raising
there are changes to the genitals and anus (for example, the penis gets hard, the anus feels relaxed, the vagina gets wet, the clitoris and labia might swell)
breasts swell and nipples get erect
you feel excited; you might have other feelings too, like feeling happy or really attracted or connected to your partner
you are thinking about what other sexual things you want to do with your partner.