Lord Condon said in a statement to the inquiry: "In my view hospitality can be the start of a grooming process which leads to inappropriate and unethical behaviour."
He added: "In any walk of life, hospitality can be appropriate, can be sensible, can be necessary, can be ethical.
"But on the other side of that, it can lead to inappropriate closeness, and in some cases that can lead to criminal behaviour."
More top news
An exit poll is due later tonight and counting will begin on Saturday morning, with the result expected later that day.
Major General Felix Gedney admitted "we don’t know exactly where he is" and it's still unclear whether has been killed.
Heavily pregnant Zara Tindall was watching from the sidelines as the Duke of Cambridge took part in a charity polo match.