This comment has lots of specific detail and is definitely TMI (You have been warned...)
I had the same problem. Too many stitches or too 'tightly' stitched up (i'm not sure which) so it was very painful to even attempt sex with DH. I had forceps delivery and had a sideways cut up into the labia (avoids cutting the perineum) and up the internal vaginal wall (big baby, even bigger head) and bled a LOT after delivery, so apparently the 'prettiness' of the repair was not an important factor at the time, they just wanted to stop the bleeding.
When DS was about 5-6 months old I went to GP and she prescribed a numbing cream, it had 4% lidocaine or something-caine in it that worked reasonably well. Apply 5-10 mins before sex and it didn't really hurt (comparatively) although was often tender for a few days afterwards. Felt like I had created a small tear down there a few times.
Over a year or two since I was given the cream (used it for about 3 months) things have greatly improved, although it is still not very comfortable at times, and certain positions are impossibly uncomfortable.
I googled this some time ago and apparently there is a small operation (done as an outpatient & under a local anaesthetic I think) you can have to correct the problem, but it sounded like it would be a fairly uncomfortable recovery, so I haven't followed it up. I'm kind of hoping that it will fix itself over time. It's not really doing that though, so I may just bite the bullet and ask GP to refer me for the surgery...
I strongly recommend talking to your GP (I asked to see a female GP - she wanted to have a look to check it had healed and how it looked anatomically) the cream is a huge help.