How you make a boy wet?

Some boys will start of by leaking out Cowper's fluid (precum) when they get sexually exited, playing with their penis is enough to get this started. However there are many that will not exhibit this trait and will not secrete anything but semen at the time of orgasm. therefore the lubrication tends to depend more on the woman then on the man. if none is forthcoming from either then a personal lubricant like KY gel is very useful.