We lose ourselves and find ourselves. The experience has nothing to do with the way people subsequently interpret the experience. That is the work of a religious community which teaches an initiate to fuse its construction of reality with an experience that in itself is beyond words. That's the work of organized religion. The vision of universal connectedness that often attends religious experience is simply the truth about the world.
Mystics are just ordinary people who see that.
Sexuality too is about losing ourselves in the deepest intimacy, our boundaries dissolving as we become present to another so profoundly that we are transformed by the experience. Sexual love in its depths is as redemptive as any sacrifice, as fulfilling as any self-surrender. Over time we bring to the persons we truly love an attitude that is almost religious. The person to whom we come closer and closer becomes at the same time more and more an unknowable mystery. We discover a kind of piety and gratitude infusing our relationship, what some traditions call grace.