I was adamant in chat that I wasn't going to answer this question, which of course ultimately meant one thing: I'm answering this question.
Er. . . there's the "probity-probe" used by security outside of Gringotts, which sounds like it could possibly be a multi-purpose instrument * cringe * Love potions likely increase the libido. Heck, alcohol might increase the libido, and alcohol abounds in Potterverse. The spell Incarcerous conjures magical ropes. And I hate to say it, but there's the Imperius Curse.
I found three comments J.K. Rowling has made regarding sex in Potterverse:
"Rowling certainly isn't afraid of sex, as Order of the Phoenix -- which had Harry making out with the beautiful, grieving Cho Chang -- ably demonstrated. Harry and his friends are now 16, and it would just be weird if Harry didn't have more on his mind than wands and snitches. "Because of the demands of the adventure that Harry is following, he has had less sexual experience than boys of his age might have had," Rowling allows. "But I really wanted my heroes to grow up. Ron's hormones get fuller play in book six." Cue the throaty alto laughter. "Basically it dawns on Ron that Hermione's had some action, Harry's had some action and he's never got close!" Time magazine - 07.17.05
Q: Did Dumbledore, who believed in the prevailing power of love, ever fall in love himself?
JKR: My truthful answer to you... I always thought of Dumbledore as gay. [ovation.] ... Dumbledore fell in love with Grindelwald, and that that added to his horror when Grindelwald showed himself to be what he was. To an extent, do we say it excused Dumbledore a little more because falling in love can blind us to an extent? But, he met someone as brilliant as he was, and rather like Bellatrix he was very drawn to this brilliant person, and horribly, terribly let down by him. Yeah, that's how i always saw Dumbledore. In fact, recently I was in a script read through for the sixth film, and they had Dumbledore saying a line to Harry early in the script saying I knew a girl once, whose hair... [laughter]. I had to write a little note in the margin and slide it along to the scriptwriter, "Dumbledore's gay!" [laughter] "If I'd known it would make you so happy, I would have announced it years ago!"
Carnegie Hall - 10.20.07
Q: Did Bellatrix ever love her husband, or did she have love only for Voldemort?
JKR: She took a pureblood husband, because that was what was expected of her, but her true love was always Voldemort.
The Leaky Cauldron Webchat - 07.30.07
"Molly was the one to finish off Bellatrix to demonstrate her other talents, and to show the clash of loves, Bellatrix's obsession with Voldemort and Molly's maternal love."
Carnegie Hall - 10.20.07
In canon, Half-Blood Prince seems to be the hormonally-driven novel of the series. We have Ginny dating Dean Thomas, and then Harry. We have Won-Won and Lavender Brown. Ginny, while berating Ron for never having snogged someone, points out that Hermione kissed Viktor Krum during Goblet of Fire. Of course in Order of the Phoenix, Harry kisses Cho Chang. Pansy Parkinson and Draco Malfoy are awfully cozy on the Hogwarts Express during HBP. Bellatrix Lestrange has a full-blown sexual obsession with Voldemort, as noted above.
Moving on to Harry Potter fandom. . .
Okay. . . in Harry Potter fandom, the term (Highlight to read. NOTE: NSFW! NSFW! NSFW!)
is an accepted spell for. . . well. I think it's self-explanatory. The term is so ubiquitous in fandom that there is an annual HP conference of the same name.
Sex and Harry Potter, as well as gender roles, are very popular topics at the major HP conferences. A sample of titles of presentations and academic papers include but are not limited to:
- The Violently Sexual Politics of War in Harry Potter and the Order of the Phoenix
- Fanfiction Imagines Snape's Sexual Past: Transgression, Titillation, and Triumph
- Challenging Morality: Fanfiction as Community Dialectic
- Metaphorical Queerness in the Harry Potter Books
From The Witching Hour: A Magical Compendium (Amazon Link)
- The Magic and the Profane
- Crossing Age Lines in Fanfiction
From Phoenix Rising: Collected Papers on Harry Potter (Amazon Link)
- Our Business: Why I'm Glad J.K. Rowling Outed Albus Dumbledore
- Beyond Binary: Recognizing the Fluidity of Sexual Identity in the Harry Potter Series
- The Women of Harry Potter
- Snape's Mary Sues: A Visual Field Guide for Identifying and Understanding Mary Sues Paired With Snape
From Terminus: Collected Papers on Harry Potter (Amazon Link)
Just as a general FYI, these academic compendiums on Harry Potter contain some excellent papers and presentations on both typical and unusual topics in the series. I would recommend them to the true Potter geek who wants to dig as far into canon as possible.