I think this would be confusing for a virgin, but mind you… virgins won’t be good at sex.
Let’s see, enthusiasm is getting to know your lover.
By that I mean (and this won’t work if you’re shy), but watch their reaction. Listen to their breathing. If it gets heavier and faster, keep doing what you’re doing. If you’re a missionary, move your hips a bit if he’s inside you. Use your hands, if he’s pumping inside you, gently run your fingertips over his arms, (If he’s too ticklish, don’t… you only learn by doing). Make eye contact, smile if he’s unsure.
Sigh a little in a soft way when it feels good. Moan gently when it really feels good. Breathe heavily in a natural way, not a fake porn star way. If you can reach, and he enjoys it when you are making out, nibble on his ear, breathe across it. Remember not all men are the same. If you can gently massage yourself, the feeling of clitorial stimulation while being penetrated is amazing. It might feel weird at first, but find your rhythm. Make sure you’re observing his reaction.
Change positions after a bit, or if things don’t feel right. Same goes for sounds and sights in bed. Take things slow, enjoy the feelings. Experiment. Don’t get discouraged if something doesn’t work. Switch it up if it’s not, if you get a reaction, don’t stop!
Sex is amazing, and fun. Just like anything else… find your own style.
And yeah, don’t just lie there and assume he’ll do all the work. Sex is boring for everyone when it’s done like that. (Unless you’re into that stuff… I’m not judging.)