If there's no "SSSS" on your boarding pass, meaning you are not a designated selectee, then you are likely being subjected to "continuous screening." TSA policy seems to call for someone to be in secondary screening at all times.
This policy is not strictly enforced at all airports and is not generally noticable at large hubs where there are usually plenty of selectees and alarmees without resorting to continuous screening. It is particularly annoying at small airports and/or un-busy checkpoints where the mere lack of traffic guarantees you additional attention.

One suggestion if you have time is to hang around the checkpoint and wait for someone else, preferably of the same gender, to enter for screening. She will then likely get the secondary and you will escape un-groped.

You should also consider sending a written complaint to TSA and your congressman expressing how you feel about having your private parts felt up. Large-scale public outrage and media attention such as the woman that recently drove DEN-SAN to avoid breast-groping is our only hope of stopping these abuses. Right now it's up to the women to help us, as it's not (yet) official TSA policy to directly grope men's crotches. But I have no doubt we will get there, as in less than 3 years the slippery-slope has advanced from general wanding and tasteful back-of-hand examination of alarms to de-shoeing at checkpoints to "limited" palm-of-hand patdowns of people who don't even alarm to outright groping/squeezing of women's breasts.

Those who think crotch-grabbing and strip-searches will never happen are ignoring history. TSA is setting us up to tolerate more and more of these abuses with their incremental enhancements; 3 years ago we would not have accepted todays breast-groping of innocent women, but today most people are tolerating it.