Theoretically, Li Wanting's thinking wasn't wrong at all.
Suming was a young and vigorous man, and men of his age were never without a libidinous streak, liking pretty girls and hoping pretty girls liked them back. They might fantasize about having multiple wives and concubines, and if their body permitted, thirty wives and forty concubines would be even better.
But he didn't want to get involved in any "unspoken rules" of the industry.
It wasn't that he had a particularly lofty moral standard; it was that he hated hassle.
In bed, handing over some money afterward and ending the relationship would be simple enough, but with women in the circle, it wasn't so easy. A moment of impulse could lead to a heap of complications to deal with afterwards, and he couldn't be bothered with that.
Besides, walls have ears, and if he really got involved with a female actress, it would eventually come out.