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What makes an orgasm unforgettable? Inspired by National Orgasm Day on July 31 — and by International Day of the Female Orgasm, coming up on August 8 (we have Brazil to thank for that particular holiday) — we asked 12 real women to share their best stories of orgasm, and what made reaching the top so memorable. Here, you'll find a range of sexualities and scenarios, from a steamy, sex-toy-powered threesome to a late night at the office. More than one of these orgasms was achieved with a little chemical assistance, but as you’ll see, sometimes the “wow” factor came from an unexpected place. Enjoy!