Being a virgin means being completely free from emotional baggage from previous sex partners and completely free from ANY possibility of disease that can be had through sex.
If you do anything that is going to leave you with regret when you meet the person you fall in love with for life, or if you exchange body fluids with someone who may carry disease (no matter what they say about their past... people lie) then you have given up freedom from baggage and disease.
Basically, when you were a virgin, you could guarantee that you would never compare you new lover to old lovers, or take your old hurts out on your new partner. You were also able to be 100% certain you had no diseases. Now you can't make that promise.
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