Anybody having a clue on what an incredible complex task space exploration truly is can't mind a little bit about such an issue. At the current state of things we can hope to explore our solar system at best. We have already started to do it by drones (Mars rover) and in the future, with the constant improvement of artificial intelligence and robotics, this will be the norm. Space travel to far aways planets such as Jupiter or even Mars are too long and risky for an human crew where drones don't need a round trip ticket.
Besides, stars' exploration, in order to be feasible, requires much more advanced technology to be researched. It involves theories such as the Alcubierre's warp drive, which requires creation and manipulation of exotic energy at the highest levels. This is probably the last technological advancement to be accomplished. Any other advancement appears to be much more at hand: nanotechnology, advanced genetics, photonic CMOS, quantum computing, strong A.I. .... everything else is a joke compared to star exploration, which means that, by the time we'll be able to reach Proxima Centauri, such issues as "how to have sex in space" will be vastly irrelevant.