How are we defining happiness? I mean, crack cocaine is pretty effective at increasing happiness for short periods of time . . .
While I love playing sports, I'd argue that they're simply a structured surrogate for the instinctive need that all people have to fight and dominate others. Not so mucha creator of happiness as a reducer of unhappiness.
Contraceptives is a tricky one. If you argue that it is a source of happiness, then you're implicitly arguing that children are a source of unhappiness. :P
The internet is an incredible tool and the dissemination of information has the potential for tremendous good but it's also the cause of tremendous melancholy and sadness. Easy access to pornography, social media, Twitter, casual sex apps, misinformation . . . Is this a net benefit to us?