"Legosexuality" "I am a Legosexual!"
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Considering how a Lego brick + bare human foot = unimaginable pain, I doubt a dog humping a newly-built construction project made with the Danish-invented toy would be equally comfortable for the poor ol' pooch, no matter how horny he was. [/hyper-smartarse]
Still, Fido could always try this:
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...but unless he's hung like a Blue Whale (and again, not taking into account the lethality of Lego; I refer you to brick + foot = >_< ), it'd be a similar situation with ol' Fido beng a Chihuahua, and the recipient of his desires being an Irish Wolfhound: she saying 'Is it in yet?!' and he replying 'It's not touching the sides!'. And even if Fido had the girth to be able to gain some 'purchase', like I say, there's the 'edginess' factor, re. Lego, even with this ring-shaped construction; unless he used plenty of Teal'c(um powder) beforehand! [/Stargate SG-1"] X3
...oh, and 'Sexual desires are a result of reproducing'? Dolphins. Bonobos. PROTIP: Humans are genetically as near as dammit to Chimpanzees. Your argument is invalid.
@Philbert McAdamia
"Top Gear"'s James May - for his occasional series "Toy Stories" - did the Isle of Man TT on a motorbike made of Meccano:
http://www.bbc.co.uk/news/world-europe-isle-of-man-23898497
Therefore as with Lego (i.e. the above Stargate), with such construction toys, one is only limited by your imagination. Many of today's premier British architects cut their engineering/designing teeth on this metal construction set invented by Frank Hornby, of model railways fame.