How to act sexy and turn him on?

Theres tons of things you can do.
When going in the bedroom wear booty shorts instead of a thong, makes their mind wonder more. Definitely don't cut the thong from your wardrobe, it's definitely good for another sexy time. You can bite your lip, like they said have good posture, (sticking out your qualities) touch parts of your body, such as neck, lower back, thighs, when he's looking it'll attract his attention to the places close to that and the things he'd like to do to them. You can really make anything sexy. Eat sexy, get dressed sexy, even work sexy.

Read cosmopolitan. You can read it online too.

honestly there are so many things to can do to be sexy, you can just learn how to stand and have proper body language. the best thing to do to get a guys attention and know that he's giving you his attention is make sure your torsos are facing each other.

The best way to act sexy is to feel sexy, try before going out or seeing whoever it is that you want to turn on, turn on a song that gets you in the mood, or putting on sexy underwear. if you feel sexy then your going to act that way.

As for turning guys on, honestly it can be very easy. but really only if he's interested in you to begin with, you don't want to be one of those girls who tries to hard. The easiest thing to do is make some sort of body contact with him, and don't make it too light, guys are less sensitive than we are. I hope I gave you some ideas. and if you have the money you should go out and get a book with dating and styling tips, pick out some favorites that you feel comfortable with.