There are those who say nothing brings to people together like the thrill of a shared adrenaline rush.

 

"I love the smell of danger, even if it's conducted in a safe environment," says Tom, who works as an accountant in a Toronto law firm.

 

"So when I asked my girlfriend Jill -- who is pretty athletic in the first place -- if she'd like to go skydiving, she literally jumped at the opportunity."

 

Leaping out of a plane at 13,500 ft. was one of the things Jill, a financial analyst, wanted to cross off her bucket list of lifelong ambitions. She appreciated the symbolic gesture behind Tom's request.

 

"I thought, 'Here's a guy who is willing to take chances,'" said Jill. "And the fact that Tom was willing to take this chance with me was a notion I found very romantic, not to mention exhilaratingly sexy."

 

Whitewater kayaking (scroll down for activity pricing) can also separate the wheat from the chaff, although the time commitment required to experience this excursion usually occurs between couples after they have a few dates under their belts.

 

"This past summer, I went whitewater kayaking with my boyfriend Bob on the Missinaibi River near James Bay," said Marie, 25.

 

"It was a six-day trip -- sort of the first time we spent any serious amount of time together -- so it gave us a lot of opportunities to get to know each other.

 

"Let's put it this way – he wasn't my boyfriend before we went away together. The trip sort of sealed the deal."

 

And even though Marie says the kayaking was more of a single boat activity with everyone traveling in packs, seeing her man in action was a complete turn-on.

 

"He was just so… masculine," she sighs. "We'd be done for the day and be pretty exhausted, but with the campfire crackling and the blood rush from what we did together… we shared a sleeping bag on a few occasions."

 

Of course, hurtling towards the earth either by parachute or bungee cord -- or speeding down a rocky river -- aren't the only ways to unleash the pheromones with your romantic partner. There are options much closer to home that can be just as electrifying and intoxicating.

 

At Gladiators Paintball Arenas in Toronto, manager Christopher Caruso says he averages 20 couples a month that arrive at his establishment ready to engage in some serious lock 'n load.

 

You might think it would be the thrill of the hunt or the strategic collaboration of man and woman to team up and outwit their predators that would be the real aphrodisiac behind paintball, but Caruso has his own theory.