Sheesh. The conversation wanders like a cow following the grass under its mouth.
To answer the original question: it depends on several factors.

If a woman has had a hysterectomy and her cervix has been removed, there's a LOT of space in there.

If a woman has done her kegels on a regular basis, she's nicely snug. If she hasn't, it's like having an affair with a Hefty Cinch-Sack that hasn't been cinched.

I've been with women who have had kids and women who haven't, and have found that although the non-mothers may be tighter on initial penetration, after a few strokes they relax a bit, while mothers who've done their exercises are just about the same after a few strokes as the non-mothers.

There is no hard and fast rule in all of this- it depends on the woman involved.
( The Resident Loon Not a demographic. Do not measure., Wed 23 Apr 2008, 16:53, Reply)