Ottage, to answer your questions specifically....
I've never done watersports. Came close only once. Met the gloriously man handsome JBoots at IML one year. He would have gladly done it, but I stopped up to his hotel room with a buddy waiting for me down in the Lobby of the Congress Hotel. It seemed uncouth to leave him down there waiting while I busied myself fulfilling a dream with one of the dreamiest hunks to grace the internet. (I'm such a good friend...)
I did piss myself twice to send to a net friend in Australia. He had sent me numerous videos and photo sets of himself so I felt inclined to return the favor. All I can say is, the 'first' time, it's not easy talking Jr. into doing something somewhere other than where society has trained him. Extra water and be patient for that stream to start.
Lack of experience aside, I think you should at least once grant your boyfriend his wish.
It's not like his interest in it will simply 'go away.' He may be curious... or he may be aching inside to fulfill a part of what sets off his buttons. Why not set off his buttons?
I would be surprised if you 'had' to receive in kind. If he's got a feel for your buttons, I'm sure he'll pick up on your lack of interest in receiving.
What's the interest???
Well, for myself it's a very masculine thing to watch a penis do ALL of what penises do.
I like 'em limp. I like 'em when they get long and strong. I like 'em hosing down the neighborhood. Or firing off
salvos. It's all just hot.
I don't have an impulse to take piss in the mouth. But I do like the idea of being 'marked' by another male. There's an Alpha Male characteristic to it. I like Alpha Males.
And if you get to liking it... and you ever find yourself at IML... My dance card is free.