I feel that it was more that the goddess had the power to tell him no

If you’re immortal, wouldn’t you want your side piece to be mortal so they wouldn’t hang around forever?

Imagine getting a clingy ex that was also immortal. “Remember that time we hooked up 8,000 years ago? We should get back together.”

Because he bangs them and then they die after a few decades. Problem solved.

Those goddesses stick around.

Ain’t no golden shower like stormy with a chance of Zeus spunk.

…

Acrisius was disappointed that he had no sons to give his throne, and asked an oracle for help. The answer he got was that his grandson would kill him. At that point, Danae was childless, and to keep the prophecy from coming true, Acrisius locked her in a tower. However, Zeus had seen Danae and had grown fond of her; so, during the night, he appeared to her in the form of golden rain and impregnated her. She gave birth to a baby, which she named Perseus.

…

Source: https://www.greekmythology.com/Myths/Mortals/Danae/danae.html

Uh… hail to the king, baby…?

Because hole.

Well, iirc, weren’t most of them like his sisters, daughters and so on?

Typical man…