In my opinion it soumds like a sexual assault. Call the police. You cannot reasonably expect to have your genitals groped everytime you go to the airport.
A person (A) commits an offence if— .
(a)
he intentionally touches another person (B), .
(b)
the touching is sexual, .
(c)
B does not consent to the touching, and .
(d)
A does not reasonably believe that B consents.
A certain person groping genitals regularly has to be sexual doesn't it?