CathInfo.com

so yes I know a lot.  Yes some men can play sports for fun without lusting after a girl.

...irrelevant. The question is whether or not you know men who play physical sports with women while simultaneously avoiding viewing their bodies. I said nothing about actually committing a sin of lust

I think the real question may be is there really a difference between admiring something beautiful like a painting and perverting it into something impure?
A person can look at a painting of a flower and say that is beautiful, but someone can also imagine that flower into something perverse. Which is correct? Is it just a flower or is it perverse?

...what on earth does this have to do with anything? Unless you are admitting that men will be staring at the bodies of women they are playing physical sports with/against, and you are equating the female body with a painting of a flower?
If so, that's just Theology of the Body nonsense. No, were not allowed to appreciate the "natural beauty" of someone's body because it's created by God, and it's good, and we should be able to do so without sinning or whatever. That's rubbish. We should keep custody of the eyes because if you are a normal, healthy man all you're doing is opening yourself up to temptation.

Probably my favorite quote regarding custody of the eyes is from St. Gregory the Great, which goes, "It is not lawful to behold what is not lawful to covet". With regards to a woman's body, unless it is your wife's (i.e. licit to "covet"), then you have no right to look at it