Should I join the 3 sum?

No harm in trying.
Ask about boundaries and state your boundaries.
Just know when the time has come to walk away.
Do not feel obligated to continue month after month.
How to walk away without guilt?
Simply say "This was fun and now I think it has run it's course."
Leave on good terms.

The cons are that there is likely to be jealousy. That will especially happen if you "click" more with one or the other of them. Are you friends with this couple? If so I would be really hesitant to accept this invitation because of how it might end up messing stuff up emotionally between them. If they are just casual acquaintances, I suppose it's their lookout.

The pro is that three-way sex is great, but it sounds like you already know that!

Its the same as with a regular couple what you have to decide is if your attracted to them enough to want to join them. If you like older people then you might enjoy it. Let us know how it goes ok

it kinda seems to me like there's a whole slew of problems in that minefield. you're enough younger than them that any sort of normal social interaction isn't really going to work well - you're just too different, basically a generation apart. it kinda seems like they're basically turning you into a living sex toy. which might be fine with you and you're totally into that. to me it sounds like there's a whole lot to go wrong and very little that can be a benefit for/to you.

be VERY careful
such adventures, often come with un for seen complications

sometimes it is a way to make a couple break up

so be sexy with them,, for a while
play it safe. but stay open to the possibilities
be SURE of what this may mean

Before jumping into bed with them, jump into a lengthy conversation. Good communication about expectations of all and each others boundaries is crucial. Plan the conversation on a night where play will not happen. If you all decide to play later, it is done so with fully informed consent by all.

There's always a first time for everything.
You can consider it as awesum or just remain lonesum. Or make it 4 sum by bringing along a friend.

Ask them what they like and tell them what you like more importantly tell them what you don't like
Then if it's suits you make your decision

I did it was very memorable just me though

Go for it! It's a great experience

Proceed with caution. Have a plan B. Tell someone where you are, and to call police if you dont call them by a certain time.

I'm curious, what have you decided? Going for it?

I say go for it !

Give it a chance, might love it

Go for it !

Mmmm I’d like to see that!

Depends on if you are feeling good about it? No strings attached good time? Go for it.

Why not?

It is fully your decision.

If you do it, enjoy and be careful.

did you join in ?????

It’s fun being the third

What did you decide?

Yes, you lead

just recently meet or have you known them long??

It's really up to you at the end of the day

How safe is it?

if you want to try it you should

God yes...that would be so hot

Think that is for you to decide.

not if you don't know the couple,

Join up if the terms are good for you

If you do it, don’t allow yourself to be photographed

50's - they must be both crazy for you ?

Probably not a good idea.

If you mean a threesome, why not call it that? 3 sum, indeed.

Don't get pregnant.

Did you join them in the threesome?

as a man in your fifties you should fit right in 👏

Threesomes, foursomes and moresomes are the best!!