Is it dangerous or beneficial to be hung upside naked for 15 or 20 minutes ?

It can stretch out your back but it takes practise to be hung upside down for any length of time.

You need the proper leg cuffs to support your weight and stop your blood supply to your feet being cut off. (Bad idea)

I think Stephan is right they do want to play with you.

There is no more benefit from being naked than to be in shorts.

If you decide to let them do it you need to:-

1) Trust them to stop if there is a problem and not go further than agree.

2) Have a safe word which will get you released quickly

3) Have them release you if your feet start to go blue or you feel pins and needles in your feet.

4) If you start to have problems breathing

5) If you start to show signs of losing consciousness.

6) They have to agree what they will do with you while you are tied up.

70 Make sure they are both on birth control as you could end up with sex with one or both,

One condition you can make is they have a threesome with you as part of the fun.

You need to be sure that the straps will take the weight properly. You do not want to fall inverted from the ceiling.

They will need a hoist to get you up there. Electric is better than manual.

One has to manage your body while the other hoists you up. Same on the way down.

What they want to do is a form of bondage.

If you want to play for fun then suggest they start with you the right way up arms fixed t the top and your legs tied apart.

They can then have some fun with you.

If that works then move on to inverted.

You say this is in the garage.

If you are brave enough suggest they tie you up when you are bursting for a piss.

The you can piss in bondage and they may well enjoy seeing you do that.

If you do that inverted they will really enjoy watching it run down your body and drip off,

A lot of the fun for them is seeing you in a situation where you are embarrassed and not in control

If you go ahead be safe and have a lot of fun.It is a chance to try something different and new.

You can only really do this if you do not have a current girlfriend.

No, the only factor you're doing is having your blood rush on your head. in keeping with hazard that's what made you so dizzy & ditzy to even think of you ought to flow your nasty fat to a diverse area of your physique.