Okay, I finally got it!
If you give any one (male or female) a ‘thing’ as a gift (like a vase or a picture frame or a stuffed animal) then they might not like it, and then you’re just contributing to their clutter problem. And if you give consumables as a gift (like candy or fruit) then they might not eat it before it spoils or they might not want to gain weight.
But if you give a woman flowers then it’s not going to be clutter because the flowers are going to die soon anyway. And she doesn’t have to force herself to eat some to prove to you that she appreciates the gift.