i vote nope..
because i dont really think sex is everything in a relationship,
and the guy basically suppose to respect the gal rite?

n plus i think ur fren's fiance/bf is doing it the wrong way that's why she feels the pain, same case with my ex which is also my first time.. his not really good in bed tho.. somtimes it's painful.. and he keeps on wanting it... n if i doesnt give it to him, he will become moody or sometimes even ignore me... ended up.. dumping him.. lol..

but my current bf is really good on d bed.. n i really did enjoy our relationship... so basically i think mayb she's not enjoying it because the guy is doing it the wrong way.. me n my best pal does agree in it ^^

hopefully tis helps a bit