Unless you are a big George Gobel fan I'm not sure you'll like The Birds And The Bees. Especially after you've seen the Preston Sturges classic The Lady Eve which this is a remake of. I wonder how Preston Sturges felt about Gobel taking over a part that was created by Henry Fonda.
One thing though, while Mitzi Gaynor got an opportunity to sing and dance a pair of numbers, one of them a duet with Gobel she sure lacks the spark that Barbara Stanwyck brought to the part of the female card shark. Glad they put those numbers in for her, giving her a chance to do what she does best.
David Niven is third billed and takes over the part of Gaynor's father which Charles Coburn played in the original. Due to his star status his part is built up somewhat. They gave him a touch of gray in his hair and Niven looked older than 46 years at the time. Three years later Niven and Gaynor would be playing husband and wife in Happy Anniversary.
Try as I might I can't conceive that Gaynor would waste her time with Gobel unless it was the millions that he had. See The Lady Eve before you see this one and judge for yourself.