ARISE OH NECRO THREAD!
Sorry, just had to jump in, some of these are great! Some would need to be on a nightgown, cause there's not enough room on a Tshirt! Some need instruction manuals for the average person to figure out.
Here's my contribution, it's a unisex:
Front:
All the good ones are either:
1. Married
2. Gay
Back
We can help with #1
I do love the strand of three chords one, though I'm not a fan of the Male+Female+Female interlock pics I've seen. I like the biblicalfamilies.org logo, or, since I've no compunction messing with the symbol of Mars, something less... blatantly phallic like so (it would need refinement, that was 2 minutes in MS paint):