Do the tips for trying for a girl (or boy) work?

Many believe that you can do certain things based on the sperm to increase the likelihood of having a boy or a girl. 
The claims are that for a GIRL:
BD further away from ovulation (slower swimmers that can last longer)
• Eat more acidic food (more resistant to acidic environment than boy swimmers)
• The woman should NOT orgasm (female organism promotes alkaline environment)
• Shallower sex position (lengthens the trip the egg, letting the boy swimmers die off)
• BD often to reduce sperm count (generally, boy sperm count is higher than girl)
The claims are that for a BOY:
• Only BD right around ovulation (faster swimmers)
• Eat less acidic food (survive longer in alkaline environment)
• The woman SHOULD orgasm (promotes alkaline environment)
• Deeper sex position (shortens the trip the egg)
• BD less often to increase sperm count (generally, boy sperm count is higher than girl)

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