To see if he is attracted to you, you can read his body language. There are usually signs that show attraction such as copying your mannerisms, laughing alot and allowing himself to be touched. There are also signs that show you that he is not interested such as leaning his body away from yours and constantly looking at his watch.
You can give a man permission to pursue you just by saying, 'Hey, [their name],' and looking right into their eyes and walking away. Then hang around in the distance where they can see you and approach. Men love to chase.
You might as well just assume so, but it's more important that you be attracted to him. You don't want to get involved with a guy who will just use you for sex, in other words. Why not? Because you're more valuable than that. Make sure you get to know him well.
Most guys will make it very well known that hey are attracted to you if they are, some are a little shy and need some encouragement try asking him out to an event where there will be several other people around so he won't feel so pressured.
It is easy for a man to be attracted to you, especially if he senses that you are attracted to him. However, that does not mean he is good material for a relationship. Only invest time in guys who are high quality.