Book collection of short sci-fi stories from Playboy

I'm looking to find a book (soft cover magazine style) of old short stories from long ago Playboy. One story is about a couple that find out that time stops when they are in their apartment bedroom and touch each other. Another is about the consequences when we send a spacecraft threw a black hole with a "greetings from Earth, RSVP" message. I think the title of that one was "RSVP". Probably from the '60's or '70's.

Here is a listing of stories in a couple of anthologies of stories that appeared in Playboy - "RSVP" is not among the titles, though. ISFDB lists several stories titled "RSVP" but none appeared in Playboy. Sorry I can't be more helpful.

Hope you find out! I would be interested in that as well.

Well, there are nine or ten mass-market-paperback anthologies of SF from that era from Playboy Press (plus some number of single-author collections...); a quick look at the anthologies and I don't see anything entitled "RSVP".

Sometime when I have a minute, I'll look inside and see if anything matches your descriptions. (Though your stories could just as easily be in one of the single-author collections....)

(Edited to add:) Here's the list of the Playboy SF anthologies I know of:

Masks
The Fiend
Transit of Earth
The Dead Astronaut
Weird Show
From the S File
The Future is Now
Last Train to Limbo
The Fully Automated Love Life of Henry Keanridge
The Playboy Book of Science Fiction and Fantasy (which is an anthology drawn from the above nine anthologies....)

I'm not familiar with that particular story, but here's another Playboy anthology to add to the list:

Playboy Stories : The Best of Forty Years of Short Fiction (1994)
http://www.isfdb.org/cgi-bin/pl.cgi?26294

It's too recent a publication to be the anthology you are remembering, but perhaps one of its story titles will ring a bell.

I vaguely recall the story about the timestop - not helpful, as I have less clue about where I saw it than you do, but at least it's confirmation it exists.

None of the stories known to ISFDB with "RSVP" in the title are a match. There's one by H. Beam Piper that's old enough, but it's freely available on Project Gutenberg and doesn't match your description (nor has it appeared in any Playboy anthology that ISFDB knows about.)

Piper's story is fantastic - but not related to the OP's question, no. Particularly amusing since I've lived in Afghanistan...

The time-stopping story sounds like "Rent Control" by Walter Tevis. I have it in The Best of Omni Science Fiction 3. I don't know where else it might be collected.

ETA: It also has a short story called "Message From Earth" by Ian Stewart, about a response to the Voyager 1 messages.

In general, Omni magazine collections might be good ones to look it. Omni was published by Penthouse, not Playboy, but that's an easy mix-up to make, I'd think. It was a nice science fiction magazine that I believe was started with some of the SF stories from its parent mag.

Ahhh yes! This is the one I've been looking for. Thank you lturpin42. Didn't know there were so many in the series. Now I just have to get it online somewhere. Maybe I'll pick up the whole series (one at a time of course). Thanks to all who replied. Great help.