In my opinion and in my research about the topic, I realized that this topic is different for men and women.When it comes to a men and this is speaking from personal experience we express our love to our partner through physical interaction it doesn't always have to be straight up sex but a long meaningful kiss here a playful spank on the *** there shows that we know you're there and we appreciate it. On the other hand women need to have strong emotional bonds with her partner in order to actually enjoy sex and I'm not talking about the physical aspect of sex but the emotional aspect. It's not just sex at that point anymore but it's actually making love. Well that's my opinion and the opinions of the researchers that I've had the pleasure of reading their articles.