I think the fact that one is attracted, aroused even, but then controls thyself.
That is the righteous strength Jesus mentions in "who is the greatest in heaven".

Sexuality is inherent to "be fruitful and multiply".

Holiness, aka Wholesomeness, means keeping your hands to yourself, and keeping IT in your pants.

Now, is that so much to ask?
Feel free to love kids all you want, just follow the Golden Rule.