I don't know if he had major active relationships specifically while working on Enigma (other than the short engagement to Joan Clarke in 1941), but Turing famously did have sexual relationships since the discovery of one eventually led to criminal prosecution of both him and his partner, his chemical castration and eventually possibly suicide.
Paul Erdős might be a better example, though I don't think he was deliberately self-denying and more just a huge oddball. Newton also never showed much interest, apparently, though an engagement was rumoured.
Many of the biggest and best-known brains in maths, engineering, physics and computing did marry: as a quick random survey: Euler, Chandrasekhar, Faraday, Maxwell, Watt, Babbage, Einstein, Dijkstra, Wiles, Hopper, Hamilton, Knuth, even Ramanujan and the Woz (4 times, even).
I don't know if he had major active relationships specifically while working on Enigma (other than the short engagement to Joan Clarke in 1941), but Turing famously did have sexual relationships since the discovery of one eventually led to criminal prosecution of both him and his partner, his chemical castration and eventually possibly suicide.
Paul Erdős might be a better example, though I don't think he was deliberately self-denying and more just a huge oddball. Newton also never showed much interest, apparently, though an engagement was rumoured.
Many of the biggest and best-known brains in maths, engineering, physics and computing did marry: as a quick random survey: Euler, Chandrasekhar, Faraday, Maxwell, Watt, Babbage, Einstein, Dijkstra, Wiles, Hopper, Hamilton, Knuth, even Ramanujan and the Woz (4 times, even).