In point of fact, offering benefits to spouses or domestic partners is inherently discriminatory against single people. Benefits are not free. If married employees receive a larger benefit package than singles we no longer have a situation of equal pay for equal work.

And I write this even though I benefit from the medical package offered by my wife's employer.

Really, the only way to treat all employees equitably is to simply offer a lump sum benefit package like a cafeteria plan through which employees can spend any way they want on their own customized package of benefits. But everyone gets the same lump sum of benefit money. Then this issue goes away.