Should guys be able to play girl sports?

Inspired by the most recent question. I thought I would ask the opposite. I personally think they should be allowed to, not because of gender but because of how skillful they are at it.
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Synchronized swimming and rhythmic gymnastics are for women only. Softball was another - it has been dropped but a campaign is mounting to reinstate it at the 2012 London games.

Some other events have a slightly different male and female version. For example, in speed swimming only women compete at 800m and only men compete at 1500m. Another example in track and field: men compete in the decathlon (10 events); women in the heptathlon (7 events).
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Olympic sports--women only
Should guys be able to play girl sports?
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