Both Christian men and women should dress modestly, and we should not dress like the opposite sex. There is quite some room for interpretation here. I work with youth at church, and have avoided going swimming with them, as I know what some of the girls would wear, as I know how they dress casually. I also have worked with all boys groups from the inner city, and don't see anything wrong with a bunch of guys going swimming together, ex: sharks and minnows, teaching the boys to swim, etc. I do go scuba diving and like swimming, and may start wearing shirts when doing either if I feel the Lord leads me. God will deal with me directly on this, I pray. Scripture is clear on the matter of nudity, and it just seems the closer you get to nude, either by less clothes or tighter, the worse. To be honest I like to go to the pool, and sometimes feel that I ought not take my shirt off in public, though I do, as we have a neighborhood pool. I think most of the preachers I admire would probably say we guys need to keep the shirts on, but 'Let every man be fully persuaded in his own mind.' It seems the issue is to not make anyone stumble. Personally, I fully admit my flesh is attracted to scantily clad girls, so I don't like being around that kind of thing, and if there are girls around I try not to look at what they are advertising. 'If you're not in business, don't advertise.' But we must remember that these girls need the gospel just as anyone. So we should look through that garbage, and remember that there is a soul that needs to be saved.Let the Bible talk:Duet 22:5 "The woman shall not wear that which pertaineth unto a man, neither shall a man put on a woman's garment: for all that do so are abomination unto the LORD thy God."1 Tim 2:9-10 "In like manner also, that women adorn themselves in modest apparel, with shamefacedness and sobriety; not with broided hair, or gold, or pearls, or costly array; But (which becometh women professing godliness) with good works."1 Pet 3:1-4 "Likewise, ye wives, be in subjection to your own husbands; that, if any obey not the word, they also may without the word be won by the conversation of the wives; While they behold your chaste conversation coupled with fear. Whose adorning let it not be that outward adorning of plaiting the hair, and of wearing of gold, or of putting on of apparel; But let it be the hidden man of the heart, in that which is not corruptible, even the ornament of a meek and quiet spirit, which is in the sight of God of great price."