When I was single.... "Sorry baby, I don't do relationships.... just sex." (said with a wink and a grin) or "Sorry, but I'm not into chicks at the moment... although, if all you want is some company, and you're volunteering to buy... (lift eyebrow here)" (also said with humor and a grin) I don't bother hiding what I want or who I am, and I never have. When I was single and got hit on, I was honest. Being no longer single, my answer these days is a "Sorry, baby, but I'm taken".
*Chuckles* I've never felt it was lame.... just not for me. At least, not until I met @Gideon. With him, it's easy and the only way that works and fits. If I (for some odd reason) somehow ended up single again, I doubt I would seek out monogamy, tho. It's not so much that our relationship converted me, but rather that with him specifically, it's what fits.
I don't get asked. Probably because I look about 14 so if anyone around my age (18-22, I'm 19) asked me out if not on uni campus, that'd be weird. "I already have a girlfriend" probably, I have someone I like and saving myself for.
Oh, I have so much experience with this I used to get asked out by guys a lot in elementary school because everyone was desperate for a girlfriend and it always used to feel incredibly wrong for me even though I couldn't work out why. So, I'd say that I wasn't ready for a boyfriend yet because I truly believed I just needed more time to develop an attraction to guys. Later on, in middle school, if I got asked out I'd just say no and if they asked why, I'd say because I didn't want to date them (that's harsh lol) In high school, I'd say I needed to focus more on my studies because my parents paid good money to send me to that school or I'd imply I already had a boyfriend. Nowadays I'd just say I'm already taken, because it's the truth.
I seem to be a cougar magnet. But being schizoid, I have poor communication skills, so I just smile wordlessly but politely and turn away.
This is the opposite of your situation, but Mom: Are you gay? Me: Um, I like men Mom: Okay Me: (inside) it's not a lie, she doesn't have to know my attraction isn't exclusive to men
Yeahhh, same. I rarely got explicitly asked, but when I did I blamed it on being busy with school and friends aha. Now depending on who asked I'd use said excuse or just say I'm gay.