Hi
Everyone has been so great with advice, id like to ask for some more please 
We are now quite experienced with anal sex, and would love to try double penitration using a dildo - is there a strap on that can be used so we can enjoy both vaginally & anal sex in DP depending on which way we fancy?
…xx
There is this…
… and if you search for double penetration on the LH site there are lots of add-on dildos which can be attached to a standard strap on to be used for DP.
Stop making toys like this or us blokes will become redundant ! 
We’re being moved past with this fancy sex tech 
This one would be perfect! Thanks for the link!.. xx