There's a contract available from Martin (the freaky science dude) in the basement of the abandoned building. He'll randomly introduce himself when the PC builds enough rep(?) The shady dealer on the dorm roof also offers a fake contract, but I'm not sure if that actually works.
Not yet. The Martin meeting alludes to some trials. Similarly, the current sugar daddy content is limited to a single npc for development/testing, but the system text and contract offering make me think there might be more to it later.
The dev's patreon posts indicate they'll be moving into more content focused development so there should be less of these teases moving forward
It's the mouse alternative for the spacebar, although I wish the dev would just let people click anywhere on the screen like the BJ minigame functions.
There is a help icon in the top left to explain the sex minigame. I know it's kind of obvious, but a few people have mentioned missing this in the discord.
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I don't believe performance impacts anything that matters, however. From what I've seen it might impact xp gain and npc affection gains, but in the short term there's isn't really a consequence to mashing through the minigame if you just want to speed things up a bit while still controlling the scene. Condoms do break, so maybe clicking is safer than mashing space in that case.