Public sex:

It is commonplace to fuck during a meal, or while waiting in line to check out somewhere, or wherever/whenever. Asking is not generally done. At the table, you fuck other people who are also at the table. If your owner is present at the meal (or owners, if there are multiple), it is important for them to reach orgasm before you may start to eat (by social convention, not by law). If you happen to notice that your owner is horny at other times, it is best for you to preemptively help them to reach orgasm, before they have to do anything about it themselves. If you're unable to help at that time, it's common to offer them the use of someone present that you own (if anyone you own is present). People who are good at anticipating their owners needs tend to reach an older age before getting snuffed, on average. It is also common enough to offer the life (and meat) of someone you own to your owner during festive occasions, allowing them to not only fuck them, but to snuff them as well. If they do not choose to snuff them, you retain ownership of them when the event ends. (You NEVER offer your own life, as they already own that and can take it at any time.)

Generally, if you're in public and see someone you want to fuck, if they don't look particularly busy, you simply walk up to them and start fucking. You don't have to know them necessarily, but if you're a guy and don't introduce yourself in some way, exchange contact information, etc, then if they're a girl and they get pregnant, you forfeit your half of the ownership of the child. If you're being fucked and don't want to be, you simply push the other person. You don't even need to say anything. They will almost always stop, look around for someone else, and go over to fuck them instead. This is rare, but does happen if someone has somewhere to be, or if they find the person fucking them to be particularly unattractive.

When waiting in line, usually one will stick their penis (or strap-on) in the ass of whoever's in front of them. This helps prevent others from cutting in front of you in line and forces you to notice if the line starts to move. These descriptions of public sex appear to favor guys, but anyone can perform oral sex on anyone else, and most women keep a vibrating strap-on in their purse, which they will use if they feel like fucking someone or while standing in line. It vibrates the base, stimulating just below their clit (usually, this is adjustable), based on the amount of pressure around the tip. As a result, anyone can wind up fucking anyone, and bisexuality is the norm, so they do. If someone wants to be fucked by a woman with such a strap-on vibrator, and the woman does not decide to do so on her own, they would have to ask her to, but all other combinations can be done without any communication at all.