Sex is great when two people approach it honestly for love or for recreation. But when one person's only agenda is to use the other for sexual gratification or out of their own dysfunction, the result is likely to lead to hurt and disappointment. There is a time in your life when you're especially likely to draw someone to you who will use you for sex. It is when you may also discover that your sexual behavior is sabotaging your relationships.
That time is when Pluto transits your 8th or 12th House. When these transits occur you may realize that your unconscious motivations are at the root of your unsuccessful relationship experiences.