when i'm with a guy, some of the things i reserve for an intimate relationship are anal sex and sex with an extra person. both require a lot of trust in your significant other. there isn't much i've left as "special" when it comes to men.
as for girls, i haven't gone down on one and i don't plan to unless she is really extremely special because that's the one thing i don't like: cunnilingus. my bi and lesbian friends tell me that once i finally get over my fear or whatever you want to call it, i'll probably love it and never want to stop. some have offered to teach me how, heh.
they're probably right, though. as for intimacy with a girl, i fondle all of my friends and have kissed several. the one thing i've done that's intimate is manual stimulation. though one of my friends and i have been teasing each other forever about strap-ons.. wonder if that will ever come to fruition.. i guess i find girls more "special" to me because i have certain things i've reserved for particular levels of intimacy. i'm also a lot more shy when it comes to being serious with girls. (i have no problem being playful with them.)