Speaking to Radio Sport's Martin Devlin, Flexman said the comments did not reflect his values.
"Having read the comment verbatim it was one thing that jumped out to me. It was a high-pressure environment when I made the comment, and the context around making the comment is somewhat relevant.
"It certainly gives the impression that there's questions around her integrity given her vocation. I regret the way it's been phrased."
The team booked a stripper at their season-ending function at the Okoroire hot pools near Matamata.
She alleged the players touched her inappropriately during her performance.
Flexman had said the stripper's claims were "one person's accusation and her standing in the community and culpability is not beyond reproach".
He told Devlin the comment was "not consistent with who I am and my values".
"I'm not in a position to make that assertion because I don't know the woman from a bar of soap."
He agreed that he needed to apologise to the woman.
"Absolutely, the context is important for me but in terms of the way it's been phrased I regret it."
Flexman said the incident would result in an investigation into the organisation's culture.
"We expect better from our players and as an organisation. We are disappointed this has happened and we weren't made aware of the players' intentions.
"We'll be seeing if we need to ask some deeper and harder questions."
The allegations come after lock Michael Allardice apologised for chanting "here come the gays" and offending members of the public at the pools.