Oliver was use to his mother's judgment when it came to his personal life. They'd been through this all before and whether Oliver liked it or not, his mother's opinion did matter to him. He had hoped to introduce her to Mandy properly, but that was out of the question now.
"Her name is Mandy, Mother. And seeing as you come by unannounced more often than not, I would say your timing is why you find half naked women in my home." He prepared his mother a cup of tea and offered her a small smile. Oliver wasn't going to apologize for what he did in his personal time. If his mother had problems with that... well, she did have problems with it, but that wasn't his problem.