they smiled a great deal


From Isaac Asimov's story "True Love"
A man dated 8 women, but none of them pleased him. So, that is what the author said about these women:
"They smiled a great deal and had pleasant voices, buy Milton always found it wasn't right."
What does "smiled a great deal" mean? is it about an attractive smile? or they(women) were very friendly?
Thank you!
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