'Is sex the main thing you want from a relationship?'
'Not always'
' I admire S. Ya. for other things than her perfect rear,' I added.
'She has a intelligent mind and holds a pretty important job, I admire that in a girl,' I lied.

The first part is true but I don't really give a damn about that. She was a fellow with the Max Planck institute for machine intelligence. Now, she teaches graduate students in the A.I. department in NYU. She knows more about Sigfrid than Sigfrid knows about himself. That suggests more possibilities in itself than sex.