Maybe the scientists will modify Steve to the point that he's always on the brink of orgasm, as that would be much more efficient for them. Which would mean that he's experiencing huge amounts of pleasure 24/7 and basically can't function. The scientists barely speak to him anyway but when they do he's drooling and takes ages to answer coherently. Probably keeps apologising, poor thing. It probably gets too much for him, and when they don't get him strapped in quick enough when he's particularly worked up he'll just drop down and start humping someone's leg, or the edge of the bed. And they'll all just be like "again? *sigh* nurse, stop him please, we can't afford to lose any samples on commander Williams' trouser leg." Poor Steve is probably so incredibly embarrassed, but he can't control himself anymore. Maybe they put a cock cage on him during the day so he'll stop touching himself so much, which results in him whining and whimpering on the bed, cock drooling and twitching but no way of release until they hook him up.