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
The 24-year-old's music has notched up more than three billion plays and more than 59 million listeners since the service started in 2008.
Blustery, wet and wintry across Scotland today - the sleet and hill snow turning back to rain.
A van driver was caught on camera swerving and weaving across three lanes of a motorway during a high speed police chase.