Sean,
I had been found to have dysplasia at one point in my paps and the OBGYN
that gave me my colposcopy told me that it is a very slow developing type.
It can take up to 3 years to develop into cancer.  I am just passing on what
my doctor told me.  However, I did have a small spot that was missed and it
was eventually biopsied and all is well now, but as for  regular checkups
are all I need.
As for your wife, it is true that dysplasia can be increased by STD's as
well as beginning to have sex earlier in life.
http://www.womenshealthchannel.com/cervicaldysplasia/index.shtml#risk

(Snip)

Risk factors increase the frequency of occurrence. Several risk factors have
been linked to dysplasia including multiple sexual partners, early onset of
sexual activity, cigarette smoking, and sexually transmitted diseases.

a.. DES Exposure
Between 1938 and 1971, approximately 5 million pregnant women were
prescribed diethylstilbestrol (DES), a synthetic estrogen thought to help
prevent miscarriage. Its use was discontinued when researchers found it to
be ineffective and dangerous. The daughters of women who took DES have a
higher risk for developing rare cancer of the vagina or cervix, called clear
cell adenocarcinoma, and abnormalities of the cervix, vagina, and uterus.

a.. Poor Nutrition
There is growing evidence that certain vitamins, such as folic acid, play a
role in cervical health. A poor diet may also cause the immune system to
weaken, decreasing the body's ability to fight viruses such as HPV.

a.. Oral Contraceptives
Some research shows that women who use oral contraceptives may be at a
higher risk for developing cervical dysplasia. However, it is not clear if
the risk is directly attributable to the contraceptives themselves. One
reason may be that oral contraceptives interfere with folic acid metabolism
in the cells around the cervix, and folic acid may help prevent or improve
cervical dysplasia. Another reason may be that women using this method of
birth control may have increased exposure to sexually transmitted diseases,
compared to those who rely on a barrier method such as a condom

However, I had it and I was in no way cheating on my husband, I was not
promiscuous, sometimes it is just what it is, cells gone haywire.  Please
don't be distrusting of your wife.  There are other factors that can cause
dyplasia.
Take care
Salisha

Having dysplasia or cervial cancer doesn't mean your wife cheated on you.
Cancer of the Cervix is usually caused by the Human Papilloma Virus (HPV).
HPV is a family of over 100 different viruses.  It is passed between 2
people most likely through sexual intercourse.  HPV is very common.
Research estimates that 60 - 80% of people who have had sex have been
exposed to HPV at some time.  You could also have sex for the very first
time & be exposed to it if your partner has already slept with someone else.
Usually, there are no symptoms.  It can lay dorment in the body for 10 - 20
years.  So many people aren't informed about this & right away assume their
spouse has cheated on them....when it could've been you who even passed it
on to her when you first slept with your wife.  See, it all depends on the
body's Immune System.  If your wife has a weaker immune system, then it
won't fight or attack viruses as easily.  For most people who come in
contact with HPV.....they have strong body defenses & end of story.  A few
HPV virus types found on the cervix can slowly lead to cancer if they are
not found and treated.  Smoking is also a big factor too.  Protecting
yourself from other sexually transmitted infections like chlamydia &
gonorrhea is another factor.  Just remember, HPV is linked to certain
cancers in men too.  Yes, you should definately support your wife.  She will
need the support from you & for you to learn more about what she has.  My
wife has been diagnosed with stage IIB cervical cancer & we've been married
for 12 years.  I stick by here & help her.  She's going thru chemo &
radiation therapy.  It's not fun.