Hi there,
I am 34 weeks pregnant with boy/girl twins, and was all set for a vaginal delivery (both head down at 32 week scan). However, over the last weeks I have noticed that when I have a bowel movement, my bum kind of turns inside out (along with producing a nice bunch of piles). Went to the GP today who said that, while not a prolapse yet, I was on my way towards one. She couldn't give me any definite answer about the effect of pushing two babies out, but thought I was at increased risk of developing a rectal prolapse if I went for a vaginal birth and that this might require surgery later.
Other considerations are that, while I delivered my DS (4) vaginally, he needed high-up forceps (Haig-Ferguson maneuver I think it was called). The other thing is that Twin 1 at the last scan had a head circumference of >98%. The consultant kind of pooh-poohed this as scans are apparently not that accurate, but my GP pointed out that this measurement makes it likely that he has a bigger than average head.
I prefer the idea of 'natural' labour, but with the constant monitoring, the epidural etc that the hospital insists on with twins, how likely is it going to be that it is 'natural' anyway? That said, I was induced with DS1 after my waters breaking and two days of not-quite-effective-enough contractions (and no sleep), had an epidural, was induced, forced to stay on my back because his heart rate kept dipping, ended up having the forceps and it was still one of the best experiences of my life 
I'm seeing my midwife on Monday and have been told I should tell her if I want to change my plans. Any advice?