Whats with the naked male?

a few years ago I gave my computer to be fixed to another Christian.He saw that I had several nude sermons on the computer,and said that perhaps I should not do that.
Yet I wonder,why can a Christian not be a nudist?Why can one not preach in the nude?Did God not spek to Adam while he was nude?What is the problem with nude preaching?
We are containers of Christ.Christ dwells in us,and He is our life,wether we are naked or clothed.Asd a nudist I have conversations in the nude,do bible study nude,pray nude..Then surely, I can also preach naked!
The question is,why is it seemingly wrong? I think it is because my male anatomy is clearly visible.I see no reason why an exposed penis,in a public or social setting can not be visible.Nudity and being nude in itseldf is not a sin,and neither is it wrong.If men walk shirtless and barefoot..then they should also be able to walk pantsless,and naked.There is no shame in nudity,and the nude male is not a shame.