Via WeHeartIt If he's just interested in sleeping with you, he's going to want to get down to business as fast as possible. He probably won't expect you to want to hookup on the first date but definitely the second. It will be clear he's not down to wait very long to get with you. If there's not a lot of foreplay involved. Via WeHeartIt This obviously isn't the case with every hookup, but generally if a guy just wants to get you in bed he won't want to go slowly. He doesn't care to put a lot of effort into pleasing you in bed as much as he's focused on himself.
If he leaves before the sun rises or asks you to. Via WeHeartIt Generally, if you're just hooking up with someone there's no sleepovers involved. You don't wan to spend your night cuddling and talking until the sun rises so he'll get out of there as soon as you're finished. But if you went to his place he'll probably hint that you should leave pretty soon after.
If he gets upset if you don't want to sleep with him. Via WeHeartIt If a guy invites you over for pizza and a movie, it's already a clear sign that he just wants to hookup but that doesn't mean you have to. But if that's all that's on his mind, he might get angry if you make an excuse to leave before it can get to the bedroom part.
Via WeHeartIt This isn't true of all guys, some want to sleep with someone before they even know whether or not they want a real relationship. But it can be a good sign if he isn't eager to get into the bedroom with you and wants to take his time to get to know you first. If he takes his time to make sure you enjoy yourself too.
Via WeHeartIt Guys are known to be pretty selfish in bed when they just want to sleep with someone. So when he takes his time to make sure you're enjoying yourself as much as he is then you know he cares enough to be thoughtful. If he stays over after to cuddle all night. Via WeHeartIt Cuddling releases all kinds of good endorphins and serotonins to make you feel happy just as much as sex does.
So when he's willing to stay over and cuddle with you all night long it shows that he wants to be more intimate with you than just having a meaningless hookup. If he never pressures you into anything. Via WeHeartIt If you don't want to hookup right away or you're not comfortable doing something that he wants to do in bed he won't pressure you.
He's happy to take things at whatever speed you want to as long as he gets to be close to you.