Learn now the pattern of Steve:
A) Pick up girl
B) Have a date. If fail, return to A
C) Try to extend relationship. If fail, return to A
D) Have relationship; much sex, cute sex dance, happy happy
E) Somehow relationship begins to oscillate out of control
F) Run, screaming
G) Get loaded on booze and alter hair in some fashion (grow beard, shave pubes, you name it)
H) Try to recover relationship. Limps on for a while, then epic fail
I) Repeat step G, then move back to A
Since Steve freaked out when Ellen started talking marriage, I'm guessing this is destined to go on for a while. In between times, of course, he can work for USDKYA. Looking at the above, it's easy to see why Turing (the spook) recruited Steve. Turing's right: no one would believe it. I know I don't. It is the sort of thing you might dream, though, if you watched '80's-90's DOOL. The soap probably hasn't changed much.
Sven, otoh, seems to follow this plan:
A) Pick up girl
B) Much sex, happy happy
C) Return to A