I just don't feel comfortable hugging my brother's 'partners'... they always laugh and say 'awkward hug time'...
Maybe after not seeing a loved-one for a really long time, sure... but we see each other fairly regularly - so I just don't think it's appropriate.
I guess I'm a shake hands kinda guy...
*Now hugging my Nana, that's a different cup of tea... she's 93 and adorable.. I hug her at every opportunity (love my Nana to bits)...