As a full time cross dresser i'm always wearing dresses etc so my question is whats sexy for a guy to wear for splosh fun times

one thing i would also like to know on the underwear side of things, what would the male equivalent of a short black lacy slip be?

this is specifically for guys as guys rather than guys or gals in female clothes
i guess you can also include girls to dress as guys too

I like to see both male and female dressed in smart shirts either with trousers, jeans or as part of a suit.

A nicely fitted boilersuit worn over a one-piece swimsuit, and wellies.

For me anything lycra especially posing pouch, speedos or a wrestling singlet

Or a pair of wide wale corduroy dungarees

nothing

Tight jeans, especially Levi's!

for me smart suit , school uniform, ref, sea cadet, scout

It depends on how you define splosh activitis... If I just want to swim, I like to wear a jockstrap, tight Levi's 501s, sneakers, and a t-shirt. If I want to have fun (sex) in the water (which is also splosh activitis), I like to wear high-quality sexy underwear, tight sexy jeans or tight leather jeans (sometimes both), heavy leather boots, a t-shirt, a hoodie, a cool belt, and a denim or leather jacket. The splosh activitis and the fun then take place underwater. Like I said... it all depends on the definition of splosh activitis.

I've seen guys go ape when wearing pantyhose, so that's my first suggestion...

Boots and leathers..... Not sure about the underwear thing as I go 'commando'...

I would say, "Swimming Trunks!"
Peter

Levis 501's and Wesco tall engineer boots!!!

I like spandex sports wear.