Don't play with yourself during meditation. You're wasting your time and I hear that you can go blind if you do it too often.
Seriously, though, what you are experiencing is just your own internal energy. Call it qi, call in prajna, call it whatever. It's important, but if you get obsessive about it, it's going to undermine your meditation practice. Buddhist meditation is about liberation. It has nothing to do with working with subtle bodies, astral projection, or healing your Aunt Milly's lumbago from across three continents.
It's important that you don't try to raise this energy. Any forced, willful manipulation of it is completely artificial and potentially nothing more than self delusion. Removed from the hindrances, secluded, putting aside grief and covetousness for the world (including feeling that energy), it will rise all of it's own accord. When it does, just let it do what it's going to do. It will probably start to feel different. It may disappear entirely. You might also start to feel uncomfortable tension in your body; most likely you'll start to get antsy...whatever happens just sit in it. Don't move. Eventually, you will pass through a barrier. On the other side of it, all of that will dissolve and you will be left in a place that feels spacious and open. That's where you ought to be aiming for.
Don't expect this to happen all at once. It will most likely take several years of practice. You might get glimpses of it here and there, but let me assure you that when you finally arrive there, the experience will be unmistakable. Then your practice actually begins!
For now, put everything else aside.