Cipriani, VENICE For a new spin on tried-and-true Italian romance, book the recently opened Palladio Suite at this legendary hotel. After relishing its splendors (your own glass sculptures, Rubelli fabrics, wall-to-wall views of the Lagoon), take a trip through the canals in the suite's vintage mahogany motor launch. Before dinner—butler-served, in the Palladio's private dining room—unwind in the outdoor Jacuzzi on the expansive teak terrace. Judging by the 30 weddings and countless proposals at the 103-key hotel each year, the Venetian formula never fails.
Doubles from $810, Palladio suite from $6,325; Giudecca 10; 39-041/520-7744; www.hotelcipriani.com
Dar Rhizlane, MARRAKESH Designed by leading local architect Charles Boccara, the 19-room hideaway seems to glow from all the lemonwood tables inlaid with mother-of-pearl, gilded copper washbasins, and lacy cedar carvings. Relaxing in front of a traditional beehive fireplace burning fragrant eucalyptus logs, passing time under the coconut palms, and working jointly on erasing tan lines in your own private garden are just a few of the pastimes on the menu.
Doubles from $240; Quartier de L'Hivernage; 212-44/421-303; www.dar-rhizlane.com
Hotel AC Santo Mauro, MADRID Intimate spots are rare in Madrid, where couples kiss unabashedly in the street and revelers crowd the city at all hours. Fortunately for the circumspect, there's the Hotel AC Santo Mauro, hidden in a residential neighborhood near the Paseo de Castellana. Last year, 17 rooms were added when the small hotel purchased the mansion next door. But the preferred suite is still No. 107, in the original building, where cava and fruit await and the bathtub affords views over the old stables. And the private garden, where guests dine in tents lit by candles, is a long-standing rendezvous destination.
Doubles from $315; 36 Zurbano; 34-91/319-6900; www.ac-hotels.com
Hôtel de la Trémoille, PARIS Now that this 19th-century jewel box in the Golden Triangle has been given a modern makeover (note the Terence Conran restaurant and spa), it's as good-looking as it is romantic. The original Haussmann architectural details are embellished with sensuous textures and colors: sofas are painted gold and awash in red velvet; persimmon-colored fake-fur duvets drape king-sized beds. To satisfy guests' desire for privacy, the Trémoille has introduced the Hatch—an ingenious drop-off area for room service. Finally, a way to have a champagne breakfast without scrambling for your robes.
Doubles from $385; 14 Rue de la Trémoille; 33-1/56-52-14-00; www.hotel-tremoille.com
MyHotel Chelsea, LONDON The smart town house behind fashionable Brompton Cross was clearly designed with lasciviousness in mind. Most of the 45 guest rooms are outfitted in boudoir pink, but for a night of passion and decadence, check into a ruby- or scarlet-hued suite. If the shag rugs and erotic photographs don't do the trick, head to the bar for cocktail hour. There, the resident tarot card and palm reader can reveal your (or your partner's) most secret desires.
Doubles from $290; 35 Ixworth Place; 44-207/225-7500; www.myhotels.com
NH City Hotel, BUENOS AIRES A 1930's building in the historic district has entered the third millennium as the city's hottest place to sleep. The six suites on the 12th floor are the best evidence of this new classic-meets-steamy aesthetic: red and black walls, cherry-colored silk curtains, and picture windows that overlook downtown's historic domes and the silvery Río de la Plata.
Doubles from $90, suites from $130, including breakfast; 160 Bolivar; 54-114/121-6464; www.nh-hoteles.com