...so it would find any combination of the two words

You could also do it without grep and temp files:

#!/usr/bin/perl

my @words = qw(we love);

while (<DATA>) {

    # all search words must appear, but order is irrelevant
    my $found = 0;
    for my $search (@words) {
        $found = /\Q$search/i;
        last unless $found;
    }
    print if $found;
}

__DATA__
foo we love bar
love we foo bar
foo love bar we
foo we bar
love foo bar
[download]

Output:

foo we love bar
love we foo bar
foo love bar we
[download]

In place of the special DATA handle I'm using here for demo purposes, you'd use the file handle you've opened to your input file, i.e.

open my $fh, "<", $DataIn or die "Couldn't open '$DataIn': $!";

while (<$fh>) {
    ...
[download]

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