Breast sex is enjoyed by many people as part of foreplay or even a way to reach orgasm. It can be something to enjoy when, for whatever reason PIV is not an option. Typically it is important to use lube, but only where there penis will make contact with the breasts. (I.e. if you lube the breasts fully, because of slipperiness, it becomes more difficult to press the breasts together.
My wife doesn’t have large breasts so this wouldn’t work for us.
Also please take this suggestion in the spirit of love…please copy and paste the act than using the outside link that has a graphic picture to avoid stumbling blocks or give a warning of a graphic picture.
DH loves it and I know he loves to do it to completion. I don’t mind it as part of foreplay (I like to give him a little kiss to the tip as it pops up into sight). 😉 I don’t particularly care for doing it to completion. For whatever reason, it makes the skin on my chest so slippery I feel like I can’t get it clean. It runs down under my breasts and I just feel like I can’t get it all off. I usually let him do it when he joins me in the shower.