To dream that you are a virgin symbolises purity and potential. Note that the dream may not necessarily mean actual physical virginity, but could also represent emotional innocence. In particular, if you are not a virgin but dream that you are one, then it signifies past regret or remorse. You need to stop dwelling on the past and look toward the future. 

To dream that someone is a virgin indicates integrity and honesty. You may have an ideal that you are tying to attain.

To dream that you are losing your virginity refers to your desires for intimacy and closeness. You are looking to fulfill your needs for physical and emotional love. The dream may also be brought on by your waking thoughts of losing your virginity. Your mind is preoccupied by how it will be and what it would be like.