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I have seen the claim that some sexual positions are better for getting pregnant than others. For example this article on how to have baby-making sex claims:

Be a missionary

It might seem like the boring way to get intimate, but the missionary position, with all that deep penetration close to your cervix, is going to give your partner’s sperm a little extra help in their swim for the egg!

Staying behind

Doing it doggy-style is guaranteed to get your partner’s sperm close to that all-important baby-making organ – the cervix.

Do these sexual positions increase the probability of conceiving?

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I'm tempted to ask you to split this into two questions: one about the missionary position and the other about doggy-style. – Borror0♦ Feb 15 '12 at 20:44
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Most evidence here is anecdotal. There seem to be too many factors(i.e. things like how a woman's uterus is shaped; how healthy they both are, etc). The issue is how can you control for all variables. – Adel Mar 30 '12 at 22:43
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@Adel by having a large sample? – kotekzot May 5 '12 at 0:09

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