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In my reading it seems any stimulation of the prostate produces the effect of increasing PSA - thus pressing on the perineum while bike riding, riding in a saddle, a lot of sitting in general, orgasm, and similar will raise PSA test results. But nowhere have I seen a study that documents how much. A few reads hinted it was a percentage, but probably not double. Again, I haven't found facts for how much higher.
By accident, I did have a PSA blood draw immediately after DRE; and that reading came back about 10% higher than normal. 18 instead of 16 at the next draw that was taken prior to DRE - and three months apart.