I think it's extremely telling that our culture equates love with sex so much, that you differentiate friendship (the most common form of relationship) with 'love without sex' rather than marriage (or whatever) as 'love with sex'.
IMO. the equating of love with sex is why so many find it difficult to make friends.
I also find the love=sex equivalence very strange. IMO it stunts the development of close friendships who feel as if they can't form emotional bonds without also forming physical ones.
Then it also acts as a false forcing function to consider oneself bi-sexual because they love and enjoy a wide variety of people, despite not actually desiring to pursue a sexual relationship with all of them. It's bizarre how often I've heard "I'm kinda bi, but like only want to date gender Foo". Like, WTF is our notion of love anymore, and how badly are we messing up the next generation.
IMO. the equating of love with sex is why so many find it difficult to make friends.