+ because "I love you. Let's not say anything else."
+ because they steal cheesecakes together.
+ because she's been a big part of his life.
+ because they had sex in her dreams.
+ because Chandler taught Emma how to count.
+ because he saw her boobies.
+ because "how're you holding up there, tiger?"
+ because Rachel wanted to know how Chandler got through it.
+ because he hugged her when she was upset about her parents' divorce.
+ because he took her to his office Christmas party.
+ because she's a great catch.
+ because when he was setting her up with all these other guys, he didn't have to lie once.
+ because "I love you." *forehead kiss*
+ because she made him this generation’s Milton Berle.
+ because he took her to a hockey game.
+ because he told her she could get in college on a beauty scholarship.
+ because he kissed her first.
+ because their kiss was so good she collapsed.
+ because he's in college and he's in a band.
+ because Cosmo said Matt and Jen should just get married already!
+ because he was the first one to see her naked.
+ because "tit for tat."
+ because she wouldn't stop until she saw him naked.
+ because they go out on lunch dates.
+ because they went to the nail salon together.
+ because he's her Mr. Kissy.

Because they love each other. Nothing else needs to be said. ;; #2
Because "I love you." *forehead kiss* ;; #3
Because it's "tit for tat." ;; #4
Because they go to the nail salon together. ;; #5