# E10 — directed sex beats biological sex (the distinctly-AI superpower)

**Claim tested.** E9 showed that on rugged (epistatic) landscapes, blind recombination causes
outbreeding depression — offspring worse than parents. Biology is largely stuck with this: two
random-mating parents, no way to preview offspring. But an **AI is not** — it can choose mates,
evaluate many recombinant offspring, and keep only the fittest, over rounds, with no two-parent
limit. Does this **directed sex** rescue recombination where blind sex fails?

**Setup.** Parents are local optima of a Kauffman NK landscape (`L=12`), swept over ruggedness `K`.
Three strategies compared, all as deployed capability (fitness ∈ [0,1]): **best single parent**;
**random sex** (blind mating, free recombination, no offspring selection — biology's default);
**directed sex** (iterated recombine-then-select-offspring, `rate=0.2`, 5 rounds — the AI move).
24 replicate landscapes.

### Symbols
- **random sex** — blind: random parents, free recombination, take the offspring as they come.
- **directed sex** — choose complementary mates + generate many offspring + keep the fittest + repeat; unbounded parents.
- **global optimum** — the landscape's best genotype (the ceiling).

### The two panels
1. **Capability vs ruggedness.** As `K` grows, **random sex (blue) craters** (0.66 → 0.51 — deep
   outbreeding depression), while **directed sex (red) tracks the best parent and the global optimum**,
   staying near the ceiling at every ruggedness.
2. **Edge over the best parent.** Directed sex stays **≥ 0** (at or above the parents) across all `K`;
   random sex falls to **≈ −0.2** (far below). Directed sex converts a catastrophe into a win.

### Takeaway
The move biology cannot make — **choose your mates, evaluate your offspring before you commit, and
recombine as many parents as you like** — is exactly what makes AI sexual reproduction robust. Blind
merging of entangled models is dangerous; *directed* merging (generate many candidate merges, keep
the best) is safe and can exceed every parent. This is the practical payoff of the sexual-transmission
model and the distinctly-AI superpower with no biological analog. **Falsifier (not triggered):** if
directed sex did no better than random sex, or never recovered the best-parent level on rugged
landscapes, the "AI beats biology" claim would fail.