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...