Yes, it is preventive.
I had this boy in my year who had that and I heard it was quite painful.
You must go to a doctor immediately It's usually a sing of cancer!
Find a homeopathic veterinarian and ask. There are a few, but antibiotics are still the most effective remedy.
There could be a number of things that would cause this, but the fact that it is not painful and is fixed is some cause for alarm, since cancerous lumps are not usually painful and are fixed (they don't move around). But there are many benign things that could cause this, as well, such as a clogged lymph node, an infection in a lymph gland, a calcification, etc., so there is no cause for panic. I do recommend though, that you have a doctor look at it soon.
Yes, they will cover annual mammograms if they are suitable to age. Currently, under the Patient Protection and Affordable Care Act Annual Checkups and certain preventive services are covered without charge. Various carriers may designate a different age as the year in which Mammograms are offered as Preventive service. IF the mammogram is DIAGNOSTIC due to finding a lump for example, the mammogram is more likely to be treated as a diagnostic lab test. A great deal depends on how the doctor codes the test.
Painful.
1989. He had laminitis, a very painful, and usually incurable hoof disease.
it is probably infected
If you are a 40 year old man, it is recommended to be screened for blood pressure, colon cancer, and cholesterol. Women should receive the same screenings along with a mammogram and a pelvic exam.
The first sexual experience is probably less painful the older the participant. A 35 year old woman is at the peak of her sexuality, lubrication & has probably had enough life experiences that the first sexual experience shouldn't be painful if her lover is patient and skilled.
Demeter was happy six mounts of the year; but when Pershone Demeter's daughter was with Hades for the other six mounts of the year, Demeter was mad, pittyless, painful (not to be messed with).