<human>: Can you provide a brief rundown of the text in within 3 sentences?

I was in my anatomy class not to long ago and we were discussing the release of chemicals in the brain and their functions. A woman had raised her hand and asked if there is a biological factor for men having a harder time falling love the more sexual partners they have had. The professor divulged that when men and women first lose their virginity their brains release so many chemicals that they feel they are in love with their 1st partner on a certain level. He said women don't lose this chemical release or feeling the more partners they have because it is typically an emotional experience. He said men on the other hand typically see sex as a physical act and said that the more sexual partners they have the less likely they are going to associate sex with love. The class kinda laughed because thats almost the unspoken rule with men I guess, not to associate sex with love but at some point we all do. I just didnt know if my teacher was correct in the fact that men not falling in love as much after sex is a biological factor as much as it is a cultural factor.
<bot>: Are men not falling in love just as much of a biological factor, with a slower release of hormones and chemicals with more sexual partners they have, as much as a cultural factor?