I want to ask the guy next door for casual sex. I am a virgin, and I know nothing. Any ways I can ask him?

Morality aside, the act of sexual intercourse without the accompanying psychological component of close attraction between the two participants very frequently turns out a to be a less than satisfying experience.

That's just the way we humans are "built."

If a the best satisfaction you can derive from the best sexual experience of that type is rated at 100%, I would say the best you can hope for from an encounter with your neighbor will be in the range of 30% to 60%.

When I was in my 20's and 30's, I turned down a number of such "opportunities" and never regretted those decisions.

Why on earth would you want to do that? I don't understand it. It's a huge mistake

I suppose it could be one of those stories you tell later on in life . . . Unfortunately you have no way of knowing if the story will be one of "Regret" or one of those "Special Memories" . . .

I could never engage in something so frivolous . . . BUT, it is not unheard of to be Spontaneous or Care Free . . . Be sure to do some of your thinking with anticipation of the consequences to follow.

Situations and circumstances enter our lives, it is how we deal with them that defines us as a person . . .

Seriously?

You shouldn't throw your virginity around as it's nothing to be valued. Is there a big rush for you to lose your virginity? Are you anxious to acquire an STD or become pregnant?  And yes, pregnancy does occur even when using birth control. Nothing is foolproof.

No one here is going to give you advice on how to have casual sex with someone you barely know. I would re-think your stance on this issue, if I were you.