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Sure, sexual tension happens between men, but much less soI'm pretty sure this isn't true.
The argument which I think is particularly invalid is not that sexual tension may exist -- it'd be ridiculous to negate it will probably exist -- but that women must be excluded in order to eliminate it.
Also, exactly which dangers to the mission do they foresee due to "sexual tension"? Unwanted competition? But said competition between men can arise from almost anything! Unwanted competition for a single resource? (Forget for a moment the inherent sexism of considering women a "resource") Easy fix: make half the team women, the other half men.
I am assuming they screen team members for psychological stability, professionalism and teamwork, right?