Advice for a swing?

My husband and I recently purchased this over the door sex swing...

http://www.lovehoney.co.uk/product.cfm?p=33424

...and I am looking for any tips, tricks or advice you super people have.

We soooo want to love it but its a struggle. I am a couple of inches taller than my husband, 3 stone heavier and have the flexibility of a plank! He has the upper body strength of a rich tea biscuit that has been dipped in tea for a moment too long. We have tried and tried and better tried but I end up bum to elbow all higgledy piggledy which is far from fun. That's just been trying to get into a decent position never mind attempting to do anything in it.

Anyone able to help?

I was going to suggest the above too, can't help feeling it will be far better than held against the door, just make sure you install a suitable hook correctly to spread the weight across the beams

We did look at those ones but we have unsuitable ceilings and rented accommodation. We are going to keep trying!