Eddie can be worn when your penis is flaccid (soft) or erect (hard). It can be used before, during, or after foreplay or intercourse. It depends on your preference, and what provides the best result for you and your partner. Eddie by itself was not designed to help you achieve an erection, but the ED Guide video series has information and exercise focusing on sex, intimacy, arousal, achieving erections, and more.
We recommend trying Eddie alone, first, before trying it with a partner, to become familiar with how it feels and works.