  Stellar binaries are ubiquitous in the galaxy and a laboratory for
astrophysical effects. We use TESS to study photometric modulations in the
lightcurves of 162 unequal mass eclipsing binaries from the EBLM (Eclipsing
Binary Low Mass) survey, comprising F/G/K primaries and M-dwarf secondaries. We
detect modulations on 81 eclipsing binaries. We catalog the rotation rates of
the primary star in 69 binaries and discover 17 ellipsoidal variables. In a
large portion (at least $\sim 51\%$) of our sample, we detect photometric
modulations consistent with two over-densities of spots on the primary star
that are roughly $180^{\circ}$ apart. We show that these so-called active
longitudes are preferentially at the sub- and anti-stellar points on the
primary star. Physically, this means that the spots on the primary star
preferentially face directly towards and away from the secondary star.
