Taking part in a gangbang or bukkake (not at all against the idea of being on the receiving end, but finding being on the giving end far more appealing).

Taking part in threesomes of the MFM or MMF kind (have done mmm in the past, not too keen on FFM ones).

Taking part in regular circle jerks, like belonging to a club or something like that.

Having my feet licked and my toes sucked by an otherwise "straight" guy.

Getting a girl to rim my ass. Have done it to both guys and girls in the past but have only had it done by guys before.

11 and 7.5, respectively

Keyword: bukkake.

Maybe socks in winter?

Naked or at least barefoot with maybe a sleeveless t-shirt.